This gambling glossary explains sports betting, casino, poker, racing, lottery, and esports terms in plain English.
Use the full A-Z gambling glossary below to check quick definitions of common gambling terms, such as acca, house edge, implied probability, RTP, vig, bankroll, cash out, and wagering requirements.
Most Searched Gambling Terms
These are the terms people usually want explained first on our gambling glossary page.
- Accumulator: One bet made up of several selections. Every leg must win.
- Bankroll: The money you set aside for betting or casino play.
- Cash Out: Settling a bet early before the event has finished.
- Expected Value: The long-term value of a bet compared with its true chance.
- House Edge: The casino’s built-in mathematical advantage.
- Implied Probability: The chance suggested by the betting odds.
- Point Spread: A handicap used to make two teams closer in betting terms.
- RTP: Return to Player, usually shown as a percentage on casino games.
- Vig / Juice: The bookmaker’s margin built into the odds.
- Wagering Requirement: How many times a casino bonus must be played before withdrawal.
Main Gambling Glossary A-Z
You can click on a letter to jump to that part of the page. Hit back to return to the top.
A
Abandoned
An abandoned race or event is cancelled before completion, often because of bad weather, unsafe conditions, or technical problems.
In horse racing, bets on abandoned races are usually void unless the bookmaker’s rules say otherwise.
Acca
An acca, short for accumulator, is one bet made up of several selections. Every selection must win for the bet to pay out.
Example: a £10 five-fold football acca only wins if all five teams land.
Across the Board
Across the board is a horse racing bet used mainly in North America. It covers win, place, and show on the same horse.
If the horse wins, all three parts of the bet pay. If it finishes second, the place and show parts pay. If it finishes third, only the show part pays.
Against the Spread
Against the spread means backing the underdog with a points start.
Example: if an NFL team is +7.5, it can lose by seven points or fewer and still cover the spread.
All-Weather
All-weather is a synthetic horse racing surface designed to handle wet or cold conditions better than turf.
Common all-weather surfaces include Tapeta, Polytrack, and Fibresand.
American Odds
American odds show how much you can win from a $100 bet, or how much you need to stake to win $100.
Example: +200 means a $100 bet wins $200 profit. -150 means you need to stake $150 to win $100 profit.
Antepost
Antepost betting is a UK term for betting on an event before the final field is confirmed.
It’s common in horse racing. The upside is bigger odds. The risk is that your selection may not run, and your stake can still lose.
Arbitrage Betting
Arbitrage betting means backing all possible outcomes at different bookmakers so the prices lock in a profit.
It sounds simple, but limits, odds changes, account restrictions, and void bets can make it harder in practice.
Asian Handicap
Asian handicap betting removes or reduces the draw from a soccer market by giving one team a virtual head start or handicap.
It’s often used by bettors who want more precise lines than simple win-draw-win betting.
B
Back
To back a selection means to bet on it to win or happen.
Example: backing Arsenal to beat Chelsea means your bet wins if Arsenal win the match.
Backmarker
A backmarker is a horse or competitor sitting near the rear of the field during a race.
Some horses are natural hold-up types, while others may be struggling to keep pace.
Banker
A banker is a selection expected to win, often used as the strongest leg in a multiple bet.
No bet is guaranteed, so “banker” should be treated as confidence slang, not certainty.
Bankroll
Your bankroll is the money set aside for betting or casino play.
Good bankroll management means using a sensible stake size so one bad run doesn’t wipe you out.
Bankroll Management
Bankroll management is the process of controlling stake size and risk.
A simple approach is to bet in units, such as 1% or 2% of your bankroll per bet.
Best Odds Guaranteed
Best Odds Guaranteed, or BOG, is a horse racing offer where you get the better of the early price you took or the Starting Price.
Example: if you back a horse at 4/1 and it wins at an SP of 6/1, BOG pays you at 6/1.
Bet Builder
A bet builder lets you combine multiple outcomes from the same event into one bet.
Example: Team A to win, over 2.5 goals, and one player to score in the same football match.
Bet Boost
A bet boost is a promotion where the bookmaker increases the odds on a selected bet.
The useful bit is checking whether the boosted price is still better than prices available elsewhere.
Betting Exchange
A betting exchange lets customers bet against each other rather than directly against a bookmaker.
You can back outcomes or lay them, which means betting against something happening.
Betting Pool
A betting pool combines all stakes into one shared pot, with winners paid from that pool after deductions.
Lottery pools, Tote betting, and some racing products use this model.
Betting Strategy
A betting strategy is a structured way of choosing bets and stake sizes.
Useful strategies focus on price, probability, bankroll control, and repeatable edges. Systems based only on doubling stakes after losses are much riskier.
Blinkers
Blinkers are horse racing headgear used to reduce a horse’s side vision.
They’re designed to help the horse focus, but they don’t automatically improve performance.
Bookmaker
A bookmaker, or bookie, takes bets and sets odds on sports, racing, casino-style products, and other markets.
The bookmaker’s margin is built into the prices.
Brought Down
Brought down is a jumps racing term for a horse that falls because another horse falls or interferes with it.
It is usually shown as “B” in form figures.
Buying Points
Buying points means taking an alternative spread or total in exchange for different odds.
Example: moving an NFL team from +3.5 to +4.5 gives you more points, but the odds will be shorter.
C
C&D
C&D means course and distance winner in horse racing.
It tells you the horse has already won at the same track over the same trip.
Cash Out
Cash out lets you settle a bet before the event has finished.
It can lock in profit or cut a loss, but the offered amount includes the bookmaker’s margin.
Chalk
Chalk is another word for the favorite.
In US betting, a “chalky” result usually means the short-priced favourite won.
Chasing Losses
Chasing losses means increasing stakes or taking worse bets to try to win back money already lost.
It’s one of the clearest warning signs that betting is no longer under control.
Closing Line Value
Closing line value, or CLV, compares the odds you took with the final odds before an event starts.
If you regularly beat the closing line, it can suggest your price selection is strong.
Colt
A colt is a male horse aged four or younger who has not been gelded.
Commission
Commission is a fee charged on some betting platforms, usually on winning bets.
On betting exchanges, commission is normally taken from net winnings. In sportsbook pricing, the bookmaker’s cut is usually built into the odds.
Connections
Connections are the people linked to a racehorse, such as the owner, trainer, jockey, and stable staff.
Counter-Strike Betting
Counter-Strike betting means wagering on CS2 matches or markets, such as match winner, map winner, round handicaps, totals, or outright tournament winners.
Map pools and vetoes matter more in CS2 than many casual bettors realise.
Cover the Spread
A team covers the spread when it beats the handicap line set by the bookmaker.
Example: if a basketball team is -6.5, it must win by seven or more points to cover.
Crypto Casino
A crypto casino accepts cryptocurrencies such as Bitcoin, Ethereum, Litecoin, or Tether.
Crypto deposits can be fast, but withdrawals still depend on account checks, network conditions, and casino rules.
D
Decimal Odds
Decimal odds show the total return for each unit staked.
Example: a £10 bet at 2.50 returns £25 in total, including the original £10 stake.
Derby
A derby is a match between local rivals.
Examples include Manchester United vs Manchester City, Celtic vs Rangers, and Arsenal vs Tottenham.
Dirt
Dirt is the main racing surface used in US horse racing.
It can ride very differently from turf or synthetic tracks.
Dog
Dog is short for underdog, meaning the team, player, or horse expected to lose.
Double
A double is one bet made up of two selections.
Both selections must win for the bet to pay out.
Draw
A draw means the event finishes level, with no winner.
In soccer, the draw is usually a standard result in three-way betting. In many US sports, tied outcomes are handled differently depending on market rules.
Draw Bias
Draw bias is a horse racing term for an advantage linked to a horse’s stall position.
On some tracks and distances, low or high draws can perform better because of the course shape, ground, pace setup, or rail position.
Drift
A price drifts when the odds get bigger.
Example: if a horse moves from 3/1 to 5/1, it has drifted in the market.
Dutching
Dutching means backing multiple outcomes so that the return is similar whichever one wins.
It’s often used in horse racing or outright markets when a bettor likes more than one selection.
E
Each Way
Each way is a bet split into two parts: win and place.
If the selection wins, both parts can pay. If it places but doesn’t win, only the place part pays.
Edge
An edge is an advantage over the market.
That could come from better research, faster information, sharper odds comparison, or finding a price that is bigger than the true chance.
Esports Betting
Esports betting means wagering on competitive video games such as CS2, League of Legends, Dota 2, Valorant, or Call of Duty.
Common markets include match winner, map winner, round handicap, totals, and tournament outrights.
Even Money
Even money means odds of 1/1, 2.00, or +100.
A winning £10 even-money bet makes £10 profit, plus the original stake back.
Expected Value
Expected value, or EV, measures whether a bet is profitable in the long run based on its true chance and available odds.
A positive EV bet is one where the odds are bigger than the real probability suggests they should be.
Exotic Bet
An exotic bet is any market beyond standard win, spread, or total betting.
Examples include correct score, first goalscorer, forecasts, tricasts, player props, and some multiples.
F
Favourite
The favourite is the selection with the shortest odds in a market.
Short odds mean the bookmaker thinks that outcome is more likely than the others.
Field
The field means all runners or competitors in an event.
In horse racing, it usually refers to all horses taking part in the race.
First Goalscorer
First goalscorer is a football bet on which player will score the first goal in the match.
Rules vary if the player doesn’t start, so check the bookmaker’s terms.
Fixed Odds
Fixed odds are prices locked in when you place the bet.
If the odds move after your bet is accepted, your original price still stands unless the bookmaker’s rules say otherwise.
Flat Racing
Flat racing is horse racing without jumps.
It can be run on turf, dirt, or all-weather surfaces.
Fold
Fold is a poker term for giving up your hand.
Once you fold, you can’t win the pot.
Free Bet
A free bet is a promotional stake given by a bookmaker.
Most free bets return winnings only, not the free bet stake, so a £10 free bet at 3/1 usually returns £30 profit rather than £40 total.
Full Cover Bet
A full cover bet includes all possible doubles, trebles, and larger multiples from a set of selections.
Examples include Trixie, Yankee, Lucky 15, and Goliath.
Furlong
A furlong is a horse racing distance equal to 220 yards, or one-eighth of a mile.
G
Gelding
A gelding is a male horse that has been castrated.
Many male racehorses are gelded to help temperament or focus.
Going
Going describes the ground condition at a racecourse.
Common UK descriptions include heavy, soft, good to soft, good, good to firm, and firm.
Goliath
A Goliath is a full cover multiple bet with eight selections.
It contains 247 individual bets, so the stake can get expensive quickly.
Grey Market
A grey market is a gambling market where access exists but the legal or regulatory position is not fully clear.
This is common in offshore betting and some sweepstakes-style gambling products.
Gross Gaming Revenue
Gross gaming revenue, or GGR, is the amount operators keep after paying out winnings.
It’s a key number in gambling industry reports.
H
Handicap
A handicap gives one side a virtual advantage or disadvantage to make a market more balanced.
In horse racing, a handicap race assigns different weights to horses. In sports betting, a handicap can refer to point spreads or goal lines.
Hard
Hard is a racing ground condition where the turf is very firm.
Hard ground can be fast but may not suit every horse.
Hedge Betting
Hedge betting means placing another bet to reduce risk or lock in some profit.
Example: backing a team before a tournament, then betting the opponent in the final to guarantee a return.
High Roller
A high roller is someone who bets or plays with large stakes.
Casinos often use the term for VIP customers, but large stakes also mean larger swings.
Hit
Hit is a blackjack term for asking for another card.
Hole Cards
Hole cards are face-down cards dealt to a player or dealer.
The term is used in poker and blackjack.
Home Field Advantage
Home field advantage is the edge a team may have when playing at home.
It can come from crowd support, travel, familiarity, or conditions.
House Edge
House edge is the casino’s built-in mathematical advantage.
Example: a game with a 2% house edge should return about £98 for every £100 staked over a very large sample, although short-term results can vary heavily.
I
Implied Probability
Implied probability converts odds into a percentage chance.
Example: decimal odds of 2.00 imply a 50% chance before bookmaker margin.
In-Play Betting
In-play betting means betting after an event has started.
Odds can move quickly during in-play markets, especially after goals, cards, injuries, map swings, or momentum shifts.
Injury Time
Injury time is time added at the end of a football half for stoppages.
It is also called stoppage time or added time.
Insurance
Insurance is a blackjack side bet offered when the dealer shows an ace.
It pays if the dealer has blackjack, but it is usually a poor-value bet for most players.
J
Jackpot
A jackpot is a large prize, often linked to slots, lottery games, or progressive casino games.
Progressive jackpots grow as more people play.
Joint-Favourite
Joint-favourites are two or more selections sharing the shortest odds in a market.
Juice
Juice is the bookmaker’s margin or fee built into the odds.
It is also called vig or vigorish.
Juvenile
A juvenile is a young racehorse, usually two years old on the Flat.
K
Kelly Criterion
The Kelly Criterion is a staking formula used to size bets based on perceived edge and odds.
It can be aggressive, so many bettors use a fractional Kelly approach instead.
Kicker
A kicker is a poker side card used to decide the winner when players have the same pair or hand rank.
Knockout Stage
A knockout stage is the elimination part of a tournament.
If a team loses, it is out of the competition.
KYC
KYC stands for Know Your Customer.
Gambling sites use KYC checks to verify identity, age, address, and sometimes source of funds.
L
Lay
To lay a bet means betting against an outcome on a betting exchange.
Example: laying a horse means you win if that horse does not win the race.
Length
A length is a unit used to describe distance between horses.
It is roughly the length of a horse’s body.
Line
A line is the price, spread, total, or handicap offered by a bookmaker.
Example: an NFL spread of -3.5 is a betting line.
Line Movement
Line movement means odds, spreads, or totals changing before or during an event.
Movement can be caused by injuries, team news, money coming in, or market correction.
Linemaker
A linemaker creates the opening prices or lines for a sportsbook.
Live Betting
Live betting means betting during an event.
In esports, live prices can move sharply after pistol rounds, map wins, draft phases, or economy swings.
Lock
A lock is slang for a bet someone thinks is certain to win.
Treat it as hype. There are no certain bets.
M
Maiden Race
A maiden race is for horses that have not yet won a race.
Map Handicap
A map handicap is an esports bet where one team receives a head start or disadvantage in maps.
Example: +1.5 maps means the team can lose the match 2-1 and the bet still wins.
Map Veto
A map veto is the process teams use to remove and pick maps before a CS2, Valorant, or similar esports match.
Vetoes are a major part of esports betting because a weaker team can still have a strong chance if its best map survives.
Mare
A mare is a female horse aged five or older.
Market
A market is a specific betting option.
Examples include match winner, over/under goals, first goalscorer, player points, map winner, or outright winner.
Martingale System
The Martingale is a staking system where you double your bet after each loss.
It can fail quickly because losing runs, table limits, and bankroll limits are real.
Moneyline
Moneyline is a US term for betting on which team or player will win.
It does not include a point spread.
Multiple Bet
A multiple bet combines more than one selection into a single wager.
Examples include doubles, trebles, accas, parlays, Yankees, and Lucky 15s.
N
Nap
A nap is a tipster’s strongest bet of the day.
It is common in UK racing and newspaper tipping.
No KYC Casino
A no KYC casino is a casino that advertises fewer identity checks or faster sign-up.
The catch is that checks may still appear before withdrawals, large wins, or suspicious account activity.
Non Runner
A non runner is a horse that was declared for a race but does not run.
Most standard win or each way bets on non runners are void, with stakes returned.
Nose
A nose is the shortest winning distance in horse racing.
It means the winner only just beat the next horse.
O
Odds
Odds show the price of a bet and the implied chance of an outcome.
They can be shown as fractional, decimal, or American odds.
Odds Boost
An odds boost is a promotion where a bookmaker increases the price on a selected bet.
A boost is only useful if the boosted price is better than the true market price elsewhere.
Odds Converter
An odds converter changes odds between fractional, decimal, and American formats.
It can also help show implied probability.
Off the Board
Off the board means a sportsbook has removed a market.
This can happen after injury news, team news, suspicious betting activity, weather issues, or pricing errors.
On the Bridle
On the bridle means a horse is travelling strongly and has not yet been asked for full effort.
It is also called “on the snaff” in racing slang.
Outright Betting
Outright betting means betting on the winner of a tournament, league, race series, or award.
Examples include World Cup winner, Premier League winner, or CS2 Major winner.
Overround
Overround is the bookmaker’s margin across all outcomes in a market.
If a market adds up to more than 100% implied probability, the extra percentage is the bookmaker’s edge.
P
Parlay
Parlay is the US term for an accumulator.
All selections must win for the bet to pay out.
Place Bet
A place bet is a horse racing bet on a runner to finish in the places.
The number of places depends on the race type, field size, and bookmaker terms.
Player Prop
A player prop is a bet on an individual player’s performance.
Examples include player shots, assists, rebounds, passing yards, kills, or headshots.
Point Spread
A point spread is a handicap used to make two teams closer in betting terms.
Example: a team at -6.5 must win by seven or more points for the bet to win.
Poker Rake
Poker rake is the fee taken by the poker room or casino from cash games or tournaments.
Progressive Jackpot
A progressive jackpot grows as more people play.
Some progressive slots have huge prizes, but the base game RTP may be lower than standard slots.
Push
A push means the bet lands exactly on the line and stakes are returned.
Example: if you bet over 42 points and the game finishes on exactly 42, the bet is usually a push.
Q
Quarter Bet
A quarter bet is a wager on a specific quarter of a game.
It is common in sports such as basketball and American football.
Quinella
A Quinella is a horse racing bet where you pick two horses to finish first and second in any order.
In the UK, this is similar to a reverse forecast.
R
Rag
A rag is a rank outsider, usually in horse racing.
It refers to a horse with very long odds and little apparent chance.
Refuse
Refuse is a jumps racing term for a horse that refuses to jump an obstacle.
Return on Investment
Return on investment, or ROI, measures profit or loss compared with total stakes.
Example: £110 returned from £100 staked is a 10% ROI.
Reverse Forecast
A reverse forecast is a bet where you pick two selections to finish first and second in either order.
In US racing, this is similar to a Quinella.
Risk-Free Bet
A risk-free bet is usually a refund-style promotion, not a truly risk-free wager.
Check whether the refund is paid as cash, bonus credit, or a free bet.
RNG
RNG stands for random number generator.
Online slots, roulette, blackjack, and other casino games use RNG software to produce random results.
RTP
RTP stands for Return to Player.
A slot with 96% RTP is designed to return £96 for every £100 staked over a very large sample. It does not predict what will happen in one session.
S
Same-Game Parlay
A same-game parlay combines multiple selections from the same event.
Example: a team to win, over 2.5 goals, and one player to score.
Scratch
Scratch means removing a horse from a race before it runs.
In North America, a scratched horse is similar to a non runner.
Sharp
A sharp is a bettor considered to be skilled, price-sensitive, or respected by bookmakers.
Sharp money can sometimes move lines.
Short Head
A short head is a very small winning distance in horse racing.
It is just bigger than a nose.
Show Bet
A show bet is a North American racing bet on a horse to finish in the top three.
Silks
Silks are the colours worn by a jockey.
They usually represent the horse’s owner.
Slot Volatility
Slot volatility describes how often and how heavily a slot tends to pay.
Low-volatility slots usually pay smaller amounts more often. High-volatility slots can have long dry spells but bigger wins.
SP
SP stands for Starting Price.
In horse racing, it is the official price of a horse when the race starts.
Spread Betting
Spread betting can mean betting on a points handicap in sports, or a separate UK product where winnings and losses vary based on how right or wrong you are.
The two meanings are different, so context matters.
Stake
Stake means the amount of money placed on a bet.
Steamer
A steamer is a selection whose odds shorten sharply after being heavily backed.
Sweepstakes Casino
A sweepstakes casino is a site that uses virtual currencies, usually Gold Coins and Sweeps Coins, instead of direct real-money casino betting.
Rules vary by US state, and availability can change.
System Bet
A system bet is a multiple bet where not every selection has to win for some return.
Examples include Yankees, Lucky 15s, Trixies, and Heinz bets.
T
Teaser
A teaser is a US sports bet where you adjust the spread or total in your favour across multiple selections.
The trade-off is shorter odds.
Tick
A tick is the smallest possible movement in odds on a betting exchange.
Tipster
A tipster gives betting advice or selections.
A good tipster should track profit and loss clearly, not just highlight winning bets.
Tissue Price
A tissue price is an early estimate of what the odds should be.
It is common in racing and betting media.
Total
A total is a bet on whether a game will go over or under a set number.
Examples include over 2.5 goals, over 220.5 points, or over 26.5 rounds.
Treble
A treble is one bet made up of three selections.
All three must win for the bet to pay out.
Tricast
A tricast is a racing bet where you pick the first three finishers in the correct order.
U
Underdog
An underdog is the team, player, or horse expected to lose.
Underdogs have bigger odds because the market gives them a lower chance.
Unit
A unit is a standard staking amount based on your bankroll.
Example: if your bankroll is £1,000 and one unit is 1%, each unit is £10.
Under
Under is a bet that the final total will be below a set number.
Example: under 2.5 goals wins if a football match has two goals or fewer.
V
Value Bet
A value bet is a bet where the odds are bigger than the true chance of the outcome.
Example: if you think a team has a 50% chance but the odds imply 40%, that may be value.
Variance
Variance describes short-term swings above or below the expected result.
High-variance betting or casino play can produce big wins and long losing runs.
Vigorish
Vigorish, or vig, is the bookmaker’s margin built into the odds.
It is also called juice.
Void Bet
A void bet is cancelled and the stake is returned.
Bets can be void because of non runners, postponed events, market errors, or specific rule conditions.
W
Wagering Requirement
A wagering requirement is the number of times you must play through a bonus before withdrawing bonus-linked winnings.
Example: a £50 bonus with 20x wagering requires £1,000 in qualifying bets.
Win Bet
A win bet is a simple bet on one selection to win.
Win-Draw-Win
Win-draw-win is a three-way market used in sports such as football.
You can bet on Team A, the draw, or Team B.
Withdrawal Limit
A withdrawal limit is the maximum amount a gambling site lets you cash out within a set time.
Limits can be daily, weekly, monthly, or tied to payment method.
X
X-Factor
X-factor is a loose term for an unpredictable advantage.
In betting, it’s better to define the actual edge, such as pace, injuries, map pool, draw bias, or matchup strength.
xG
xG stands for expected goals.
It estimates the quality of scoring chances in football and can be useful when reviewing whether results matched performance.
Y
Yankee
A Yankee is a UK multiple bet with four selections.
It contains 11 bets: six doubles, four trebles, and one four-fold.
Yearling
A yearling is a horse aged one year old.
In many racing systems, all racehorses share an official birthday.
Z
Zamboni
A Zamboni is the machine used to resurface ice in hockey.
It is not a standard betting term, but it sometimes appears in novelty hockey betting slang.
Zero
Zero is the green pocket on a roulette wheel.
European roulette has one zero. American roulette has zero and double zero, which gives the casino a higher house edge.