The initial idioms of the letter M

muse over	museum piece
mush (something) up	mushhead
mush	mushmouth
mushroom	mushroom into
music	music to ears
music to one's ears	musical beds
musical chairs, play	musical
muss up	must needs
mustard	muster
muster in	muster out
muster out of	muster up
must	mutant
fold, spindle, or mutilate	mutiny against
mutter about	under breath
mutter (something) under (one's) breath	mutter