The initial idioms of the letter M

marble orchard	marble
march	march against
March comes in like a lion, and goes out like a la	in single file
march in step	the march of time
march on	march out of time
march past	march to (one's) own beat
march to (the beat of) (one's) own drum	march to (the beat of) a different drum
march to a different beat	march to a different drummer
marche	Marches
marching orders, get one's	mare's nest
margin	Mary
marinate	marine officer
marine recruit	marine
as a pig loves marjoram	mark as
mark down	mark for life