- monodrama
- monogamist
- monopolist
- monosyllable
- monotheistic
- monotone
- monotonous
- moral law
- morass
- more information
- more kicks than half penny
- motion
- motionless
- motive
- much awaited
- muddiness
- muddled
- muffled
- multi-storied
- musical chairs
- muster
- mutation
- mutinous
- mystify
- myth
- make fun of
- make good
- meet someone halfway
- make hay while the sun shines
- move heaven and earth
- machiavellian
- maim
- make as if, make as though
- make it
- maladministration
- malignant
- manacle
- manager
- manuscript
- Mass
- matrimonial
- mausoleum
- maximum
- mean
- meagre
- mean
- meaningful
- means
- member
- membrane
- memory
- mercenary
- make merry
- mimicry
- mind out be
- mindless
- miner
- misapprehend
- misbehave
- mislay
- miss someone out, miss something out
- misty
- modernize
- mole
- moisten
- morale
- moratorium
- mould
- make a move
- muck
- mum's the word
- multiple
- multitudinous
- murderous
- muted
- mutt
- mutter
- make a point of
- meritoriousness
- mitre
- mind one's step, watch one's step
- mechanise
- monotherapy
- muggiest
- m-commerce
- man of substance
- medical science
- misandrist
- mercer
- monogamous
- moveable feast
- mange-tout
- myalgia
- motivity
- muster roll
- monsignor
- melamine
- master of fine arts
- meaninglessness
- martyrization