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M
| Maiden | 1. A race for horses that have not won a race. 2. The name given to all horses without a victory. |
| Mare | 1. Female horse aged five and above. 2. Having a bad day's punting. (having a nightmare). |
| Market | The betting amount available on any event taken as a whole. |
| Middler | US term to indicate a bettor that places bets on both sides to win both sides of the same betting proposition. For example, if you bet the underdog +3 1/2 and the favorite - 2 1/2 and the favorite wins by exactly 3 points, you have then "middled the game". |
| Money Line | US term to indicate a line offered without a handicap. |
| Monkey | A £500 bet. |
| Multiple | See accumulator. |
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