Basketball Betting Glossary — Every Term UK Bettors Need to Know
Available in US
Basketball betting borrows vocabulary from three different traditions — American sports betting, British bookmaking, and the language of basketball itself — and the result is a lexicon that can feel impenetrable if you are coming from a football betting background. I have lost count of the conversations where a UK bettor told me they avoided basketball markets because they did not understand what “covering the spread” meant or why American odds were written as negative numbers. The terminology is not difficult once you see it laid out clearly. This glossary covers the terms you will encounter at any UKGC-licensed sportsbook offering basketball markets, organised alphabetically so you can find what you need quickly. Basketball accounts for 15-18% of global bookmaker activity, and that share is growing — which means these terms are worth learning.
A to F
Accumulator (Acca) — A single bet combining multiple selections. All legs must win for the bet to pay out. Known as a “parlay” in American terminology and a “multi” in some markets. The odds multiply across each selection, creating higher potential payouts but lower probability of winning.
Against the Spread (ATS) — A team’s record when measured against the point spread rather than the actual game outcome. A team can lose a game but “cover” the spread if they lose by fewer points than the handicap allows. ATS records are one of the most useful statistics for spread bettors.
Bankroll — The total amount of money set aside specifically for betting. Also called a “betting budget” or “stake fund.” Proper bankroll management is the foundation of sustainable betting — it determines how much you risk per bet and how long you can withstand losing streaks.
Cash Out — A feature that allows you to settle a bet before the event has concluded, at a price offered by the sportsbook. The offer is calculated based on current in-play odds and includes the sportsbook’s margin.
Chalk — American slang for the favourite. “Taking the chalk” means backing the favoured team. Used more commonly in US-centric basketball betting discussions than on UK sportsbook interfaces.
Closing Line — The final odds or spread available before a game begins. The closing line is considered the most efficient price because it incorporates the maximum amount of market information. Beating the closing line consistently is the strongest indicator of long-term betting skill.
Cover — To win against the point spread. If a team is favoured by -5.5 and wins by 7, they “covered.” If an underdog receives +5.5 and loses by only 3, they also covered. The term always refers to the spread, never the straight-up result.
Dog (Underdog) — The team expected to lose, reflected by positive point spreads and higher odds. In basketball, significant underdogs are sometimes called “big dogs” when receiving spreads of 10 or more points.
Drift — When odds move to longer prices, indicating the selection is attracting less support or the sportsbook is adjusting away from the initial position. “The line has drifted from -4 to -3” means the favourite is receiving less market confidence.
Edge — The bettor’s advantage over the sportsbook on a specific bet. An edge exists when you believe the true probability of an outcome is higher than the implied probability reflected in the odds. Without an edge, you are paying the sportsbook’s margin with no expectation of long-term profit.
Futures — Bets on outcomes that will be decided at a later date, such as the NBA championship winner, MVP, or season win totals. Known as “outrights” or “ante-post” bets in traditional British bookmaking.
G to O
GAMSTOP — The UK’s national self-exclusion scheme. Registering with GAMSTOP blocks you from all UKGC-licensed online gambling sites for a minimum of six months. An important responsible gambling tool for anyone who feels their betting is becoming problematic.
Handle — The total amount of money wagered on an event or market. “The NBA Finals handle exceeded $2 billion” means that was the total wagered, not the sportsbook’s profit. Handle minus payouts equals the sportsbook’s revenue.
Handicap — The UK term for what Americans call the point spread. A team receiving a -6.5 handicap must win by 7 or more points for the bet to pay out. A team receiving a +6.5 handicap can lose by 6 or fewer and still win the bet.
Hold — The percentage of total wagers retained by the sportsbook as profit. The national hold rate in the US reached approximately 10.2% in 2025, though this figure includes all bet types. Hold on straight NBA spreads is typically lower than the overall average.
Implied Probability — The probability of an outcome as suggested by the betting odds. Calculated by dividing 1 by the decimal odds. Odds of 2.00 imply a 50% probability. Odds of 1.50 imply 66.7%. The total implied probability across all outcomes in a market exceeds 100% — the excess is the sportsbook’s margin.
In-Play (Live Betting) — Bets placed after a game has started. Basketball is particularly well-suited to in-play betting because of its scoring frequency, timeouts, and quarter structure. Lines update continuously throughout the game.
Juice — See “Vig.” The commission or margin built into the odds by the sportsbook. A standard juice on an NBA spread is around 4.5-5% (odds of 1.91 on both sides).
Line — The point spread or odds set by the sportsbook. “The line is -5.5” means the favourite is giving 5.5 points. “The line moved” means the spread or odds changed.
Moneyline — A bet on which team will win the game outright, with no spread involved. In UK terminology, this is a “match winner” bet. Moneyline odds vary with the perceived probability of each team winning.
Overround (Margin) — The sportsbook’s built-in profit margin, calculated by summing the implied probabilities of all outcomes in a market. An overround of 105% means the sportsbook expects to retain 5% of the money wagered on that market regardless of the outcome.
P to Z
Parlay — See “Accumulator.” The American term for a multi-leg bet. Same-game parlays (SGPs) combine selections from a single game into one bet.
Point Spread — A handicap applied to the favoured team to create a roughly even-money proposition. The most popular NBA bet type. “Lakers -4.5” means the Lakers must win by 5 or more for a spread bet on them to pay out.
Props (Proposition Bets) — Bets on specific events within a game rather than the final outcome. Player props (e.g., LeBron James over 25.5 points) and game props (e.g., first team to score 20 points) are both widely available at UK sportsbooks. Called “specials” at some UK operators.
Push — When the final result lands exactly on the spread, resulting in a voided bet. If the line is -5 and the favourite wins by exactly 5, the bet is a push and the stake is returned. Half-point spreads (-5.5) eliminate the possibility of a push.
Same-Game Parlay (SGP) — An accumulator where all selections come from the same game. The sportsbook prices each leg’s correlation, resulting in a higher margin than a standard multi-game accumulator.
Sharp — A professional or highly skilled bettor whose action moves lines. Sportsbooks track sharp accounts and adjust their lines in response to sharp money. The opposite of a “square” or recreational bettor.
Steam Move — A sudden, significant line movement caused by coordinated sharp action across multiple sportsbooks simultaneously. Steam moves signal strong professional interest in one side of a bet.
Totals (Over/Under) — A bet on whether the combined score of both teams will be over or under a number set by the sportsbook. “Over 215.5” means you are betting the combined score will be 216 or higher.
UKGC — The UK Gambling Commission. The regulatory body responsible for licensing and overseeing all commercial gambling in Great Britain. All sportsbooks operating legally in the UK must hold a UKGC licence.
Units — A standardised measure of bet size relative to your bankroll. If your bankroll is £1,000 and one unit is 1% of your bankroll, one unit equals £10. Using units allows you to track performance consistently regardless of bankroll size.
Value Bet — A bet where the odds offered are higher than the true probability of the outcome suggests. Identifying value bets consistently is the core skill of profitable basketball betting.
Vig (Vigorish) — The commission charged by the sportsbook on every bet. On a standard NBA spread at 1.91/1.91 odds, the vig is approximately 4.5%. Also called “juice” or “margin.” The vig is the sportsbook’s guaranteed income regardless of the game’s result.
What is the difference between vig and margin in basketball betting?
Vig (vigorish) and margin refer to the same concept — the sportsbook’s built-in commission on every bet. Vig is the American term, margin is the British term, and overround is the mathematical expression of the same idea. On a standard NBA spread, the vig/margin is typically 4.5-5%, meaning the sportsbook expects to retain that percentage of total wagers on the market.
What does ATS mean in NBA betting?
ATS stands for Against the Spread. It measures a team’s record not by wins and losses but by whether they covered the point spread. A team with a 30-20 ATS record has beaten the spread in 30 of 50 games, regardless of how many of those games they actually won outright. ATS records are among the most important statistics for basketball spread bettors.
Prepared by the Basketball Betting Guide editorial staff.
