| measure up |
| meat market |
| meat rack |
| meatspace |
| meet a sticky end |
| meet halfway |
| meet one's maker |
| melon head |
| member for Barkshire |
| memory lane |
| mental gymnast |
| merchant of death |
| mere mortal |
| Merry Andrew |
| mess of pottage |
| mess up |
| Mexican breakfast |
| mic drop |
| middle of the road |
| might as well |
| milestone |
| milieu control |
| milk the clock |
| Miller of Dee |
| mind how you go |
| mind-numbing |
| mind one's P's and Q's |
| mind one's ps and qs |
| mind the store |
| mind you |
| minor miracle |
| mint condition |
| Miss Right |
| miss the forest for the trees |
| miss the wood for the trees |
| miss the woods for the trees |
| Mister Wrong |
| mists of time |
| mixed blessing |
| mixed herbs |
| mix it up |
| mix up |
| moment in the sun |
| moment of truth |
| money for jam |
| money for old rope |
| monkey around |
| monkey business |
| monkey up |
| monkey wrench |
| month of Sundays |
| moonlight flit |
| moral low ground |
| morally bankrupt |
| more equal |
| more often than not |
| more than one bargained for |
| more than you can shake a stick at |
| mother hen |
| mother-hive |
| mother of all |
| motion of someone's ocean |
| mouth the words |
| move furniture |
| move on |
| move one's body |
| move the goalposts |
| move the needle |
| move up in the world |
| movie jail |
| much of a muchness |
| muddle along |
| mud fence |
| mud monkey |
| mukluk telegraph |
| mum's the word |
| mush up |
| music to someone's ears |
| my bad |
| my eye |
| my way or the highway |
| my word |
| made in China |
| made in the shade |
| mad money |
| magic box |
| magic touch |
| main character |
| main man |
| make a better door than a window |
| make a break for it |
| make a case |
| make a clean breast |
| make a fist of |
| make a grab |
| make a leg |
| make all the difference |
| make amends |
| make a monkey out of |
| make a move |
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