| middle of nowhere | | | |
| mile a minute | | | |
| mile-a-minute | | | |
| milk drinker | | | |
| milk of human kindness | | | |
| milling machine | | | |
| mince words | | | |
| mind one's language | | | |
| mind one's own business | | | |
| mind's ear | | | |
| mind's eye | | | |
| miners' canary | | | |
| mines and minerals | | | |
| missing stair | | | |
| mission creep | | | |
| miss the mark | | | |
| miss the memo | | | |
| mistake windmills for giants | | | |
| Mister Right | | | |
| mix apples and oranges | | | |
| mixed bag | | | |
| mixed message | | | |
| mixed picture | | | |
| modest proposal | | | |
| molehill mountaineer | | | |
| mommy brain | | | |
| Monday-morning quarterback | | | |
| money pit | | | |
| money's worth | | | |
| monkey paw | | | |
| monkey's paw | | | |
| Monopoly money | | | |
| month in, month out | | | |
| moral bankruptcy | | | |
| moral high ground | | | |
| moral of the story | | | |
| more cry than wool | | | |
| more's the pity | | | |
| more than meets the eye | | | |
| morning person | | | |
| most an end | | | |
| Mother Hubbard | | | |
| mother lode | | | |
| mouth breather | | | |
| mouthful of marbles | | | |
| move heaven and earth | | | |
| move house | | | |
| move out | | | |
| move someone to tears | | | |
| move the yardsticks | | | |
| move through the gears | | | |
| much ado about nothing | | | |
| much less | | | |
| muddy the waters | | | |
| muddy up | | | |
| mugged by reality | | | |
| mug's game | | | |
| murderers' row | | | |
| murder will out | | | |
| mutual admiration society | | | |
| my arse | | | |
| my foot | | | |
| my skull's afly | | | |
Mac + Safari
iPhone + iPad
Google Chrome
Mozilla Firefox
Opera
Microsoft Edge