Betting Glossary

A wager that has been accepted and is currently active. "Getting action" means successfully placing a bet. Some bettors are limited by sportsbooks and struggle to get action on their preferred selections.

Betting a team to cover the point spread rather than simply win the game outright. ATS records are used to evaluate how well bettors or teams perform relative to expectations set by the market.

A modified point spread or total offered at different odds than the standard line. Bettors can purchase a more favourable spread in exchange for shorter odds, or accept a worse spread for longer odds.

The standard odds format used in North America. Positive numbers (e.g. +150) show how much profit a $100 stake returns. Negative numbers (e.g. -120) show how much must be staked to win $100 profit. A $100 bet at +150 returns $250 total ($150 profit + $100 stake).

Simultaneously betting on all outcomes of an event at different bookmakers where the combined odds guarantee a profit regardless of the outcome. Arbers face significant account restriction risks as sportsbooks actively identify and limit them.

A situation where a bet that appeared to be winning lost due to an unexpected, often late-game event. Experienced bettors understand that bad beats are a normal part of variance and should not influence future decisions.

The total amount of money a bettor has specifically allocated for betting activity. Proper bankroll management is fundamental to long-term betting discipline. A bankroll should be entirely separate from essential living funds.

An individual who places bets on behalf of a professional bettor (sharp) to avoid personal account restrictions or limits. The beard is essentially a betting proxy, acting as the public face for the sharp's wagers.

An entity — individual or company — that accepts and settles bets on sporting events. Bookmakers set the odds, manage their book (the distribution of bets), and aim to generate profit through the vigorish regardless of the outcome.

The favourite in a contest. "Laying the chalk" means betting the favoured side. Casual bettors disproportionately back chalk, which is one reason why the public's money does not always move lines efficiently.

The difference between the odds at which you placed a bet and the final odds when the market closes. Consistently beating the closing line is widely regarded as the most reliable indicator of long-term betting edge, as closing lines represent the most efficient market price.

When a team wins by more than the point spread (for favourites) or loses by fewer points than the spread (for underdogs), a spread bet is won. The team is said to have "covered" or "covered the spread."

The standard odds format in Europe, Australia, and Canada. Decimal odds represent the total return (stake + profit) per unit staked. Odds of 2.50 mean a $1 bet returns $2.50 total, for a $1.50 profit. Decimal odds of 2.00 are equivalent to even money.

The team or competitor that the market expects to lose, offered at longer (higher-paying) odds. "Taking the dog" means betting on the underdog. Dogs attract sophisticated bettors when they believe market prices overestimate the favourite's chances.

A bet type available in sports with three outcomes (win, draw, lose) that allows a single bet to cover two of the three. Options are: Home/Draw, Away/Draw, or Home/Away. The trade-off for this security is significantly shorter odds.

The mathematical advantage or disadvantage inherent in a bet. Positive expected value (+EV) means that over a large sample, the bet is profitable. EV is calculated as: (probability of winning × profit) − (probability of losing × stake). Long-term profitability requires consistently finding and wagering on +EV opportunities.

Traditional odds format used predominantly in the United Kingdom and Ireland. Written as a fraction (e.g. 5/2), the numerator shows profit and the denominator shows the stake. Odds of 5/2 mean a $2 stake returns $5 profit, plus your $2 stake back ($7 total). Evens (1/1) is equivalent to a 50% implied probability.

Betting against the side that is receiving heavy public support. The theory is that public money drives lines away from true value, creating opportunities on the other side. The effectiveness of fading the public is debated among professional bettors.

A wager on an outcome that will be determined in the distant future, such as a team to win a championship, a player to win MVP, or the total wins a team will achieve in a season. Futures carry higher variance due to the extended timeframe and the large number of possible outcomes.

A bet that has been officially settled by the sportsbook as a Win, Loss, or Push (void). Bets are "graded" once the relevant sporting event has concluded and the result has been confirmed.

The total dollar amount of all bets accepted by a sportsbook over a specific period. Handle is a gross figure and does not reflect the book's profit (hold). A high-handle event like the Super Bowl or Premier League final is a major revenue generator for books.

A bet type where a virtual advantage or disadvantage is applied to one side before the match begins. Asian Handicaps eliminate the draw outcome and use half-point and quarter-point increments to prevent pushes, offering more favourable margins than traditional markets.

The half-point added to a point spread to prevent a push (tie). For example, a 3.5-point spread means a team must win by four or more to cover. Bettors are said to "win by the hook" when their team covers exactly because of the half-point.

The probability of an outcome as implied by the bookmaker's odds, including their margin (vig). For decimal odds: implied probability = 1 / decimal odds. The sum of implied probabilities across all outcomes exceeds 100% — this difference represents the bookmaker's built-in margin.

The commission built into the bookmaker's odds. At standard American odds of -110, bettors must risk $110 to win $100, meaning the book keeps $10 per $220 wagered (a ~4.5% margin). Juice is the primary mechanism through which bookmakers generate profit.

A mathematical formula developed by John Kelly Jr. that calculates the optimal fraction of a bankroll to wager, given a known edge and odds, in order to maximise the long-run growth rate of capital. Full Kelly is theoretically optimal but generates high variance; most professionals use fractional Kelly (quarter or half) in practice.

The maximum stake a bookmaker will accept on a single bet. Limits vary by market, sport, and bettor account. Winning bettors are routinely subjected to reduced limits — a process the industry calls "limitation" or "restriction."

The odds or point spread set for a market. The opening line is posted first by the bookmaker; the closing line is the final odds before the event begins. The closing line is considered the most efficient market price and is the benchmark against which professional bettors measure their performance.

The change in odds or point spread from a market's opening to a later point. "Steam" refers to rapid, coordinated line movement triggered by sharp money (professional bettors) entering the market simultaneously. Steam typically moves lines by half a point or more within minutes.

A strategy where a bettor bets both sides of a game at different point spreads, creating a "window" where both bets win if the final margin lands between the two spreads. For example, betting the favourite at -3 and the underdog at +6 creates a window where both bets win if the favourite wins by 4 or 5.

A bet on which team will win a game outright, with no point spread applied. Moneyline odds reflect the perceived probability of victory. Favourites are priced with negative American odds; underdogs with positive odds. A winning bet returns the stake plus profit according to the odds.

A bet that is cancelled and the stake returned in full, typically because a game was postponed, cancelled, or a player named in a prop bet did not participate. Void bets have no financial consequence but may affect accumulator/parlay payouts.

The mathematical relationship between odds formats. Decimal to fractional: subtract 1, express as fraction. Decimal to American: (odds − 1) × 100 if odds ≥ 2.00; −100 / (odds − 1) if odds < 2.00. All formats express the same underlying probability but present it differently for different regional audiences.

A wager on the combined score of both teams (or a specific player stat) being over or under a number set by the bookmaker. Totals betting is popular because it requires no opinion on who will win — only how much scoring (or any other metric) will occur.

A single bet combining two or more individual selections. All selections must win for the parlay to pay out. The odds are multiplied together, creating a potentially large payout from a small stake. However, parlays carry significantly negative expected value compared to placing each bet individually, primarily due to correlated outcomes and the bookmaker's margin compounding.

A virtual handicap applied to a game that levels the playing field between the favourite and underdog. The favourite must win by more than the spread; the underdog must lose by fewer points than the spread (or win outright). Spreads are the dominant betting market in American football and basketball.

A wager on a specific occurrence within a game that may not directly affect the outcome — such as a player's total passing yards, the first team to score, or the number of corner kicks in a match. Props often carry higher bookmaker margins than standard markets but can offer value when the bettor has superior specific knowledge.

When the final margin of a game exactly equals the point spread, resulting in no winner or loser — the original stake is returned. Half-point spreads (the "hook") are used specifically to prevent pushes in spread betting.

When a betting line moves in the opposite direction to where the majority of public bets are being placed. RLM is interpreted as evidence of sharp (professional) money on the other side, sufficient to move the line despite a lower number of bets. For example, if 70% of bets are on Team A but the line moves to favour Team B, sharp money is suspected on Team B.

Net profit expressed as a percentage of total money wagered. ROI = (Total Profit / Total Staked) × 100. A positive ROI over a large sample is evidence of genuine edge. Professional sports bettors typically achieve long-term ROIs of 3–8%; anything above 10% is exceptional and likely reflects a limited sample size.

A sharp is a professional or highly sophisticated bettor who bets with discipline, uses data-driven analysis, and consistently beats the closing line. A square is a recreational bettor who typically bets based on gut feeling, fan loyalty, or public narrative — and represents the majority of betting volume at any sportsbook.

Wagers placed by professional bettors (sharps) that carry sufficient weight to move the betting line. Bookmakers monitor sharp money carefully and often react by adjusting odds to reduce their exposure, even when sharp money represents a minority of total tickets.

A fast, sharp-driven movement in a betting line, typically occurring simultaneously across multiple sportsbooks. Steam indicates coordinated professional activity and causes bookmakers to rapidly adjust their prices. Recreational bettors who chase steam often receive poor value as the line moves away from them.

A variant of a parlay where bettors can adjust the point spread of each selected game in their favour, typically by 6 or 6.5 points in football. All legs must win for the teaser to pay out. While teasers appear more favourable, the reduced odds often fail to compensate for the increased probability of winning each leg.

An individual or service that sells betting predictions, selections, or purported "inside information" for a fee. The sports betting industry is saturated with touts, and the vast majority cannot demonstrate verifiable long-term profitability. No legitimate sharp requires subscription income — their edge is expressed through betting, not selling picks.

A bet is said to have "value" when the bettor's assessed probability of the outcome exceeds the probability implied by the bookmaker's odds. All professional betting strategies are ultimately about identifying and exploiting value — situations where the market has mispriced the true likelihood of an event.

The inherent statistical fluctuation in betting results around their expected value. Even with a genuine positive edge, a bettor can lose money over short samples due to variance. Understanding variance is critical to maintaining emotional discipline during losing streaks and not incorrectly abandoning a sound strategy.

See Juice / Vig. The bookmaker's built-in commission charged on all losing bets. This creates a structural negative expected value for bettors who lack genuine edge and explains why the majority of recreational bettors lose money in the long run.

A financial stake placed on the outcome of a sporting event or other specified occurrence. The terms bet and wager are used interchangeably in sports betting contexts.

Slang for a professional, disciplined sports bettor who bets with an informed advantage. Derived from the notion that these bettors are "wise" to the real probabilities and inefficiencies in the market. Bookmakers identify and limit wiseguys aggressively.