maiden
A horse that hasn't yet won a race.
maiden race
An event for horses that haven't yet won a race.
mare
A female horse that's five or more years old.
margin call
A call that a bookmaker makes to a punter for cash to cover some or all of the punter's potential loss.
market
In the context of betting, a specific type of bet offered on a particular event. Bookmakers typically offer multiple betting markets on each event.
martingale system
A betting strategy reliant on an unlimited bankroll that involves increasing the stake on a new bet each time a bet loses, with the intention of eventually recovering the lost money and earning a profit.
match betting
Match betting is betting that one of only two competitors will win a match, tournament or race.
mobile betting
Mobile betting is betting via a mobile device, such as a smartphone or tablet.
money back bet
A type of bet for which the bookmaker agrees to refund a bettor's stake, in the form of a cash refund or free bet, if a specified event occurs. Money back bets were first introduced by Irish bookmaker Paddy Power but are now offered by several major bookmakers.
money-back special
A money-back special is an offer by a bookmaker to refund the stake you place on a bet if the bet doesn’t win but a specified outcome occurs.
moneyline odds
Moneyline odds are the preferred odds format in the United States, also sometimes called American odds.
monkey
Slang commonly used by UK bookmakers for £500.
morning line
The starting odds for an event. The line serves as a prediction of what the final odds will be.
multiple bet
A multiple bet wagers a single stake on two or more selections. Each selection must be made in a different event or betting market, and all selections are required to win in order for the bet to pay out.
mutuel field
Multiple horses that form one betting interest.