The initial idioms of the letter A

a close shave	a closed mouth gathers no feet
a cloud on the horizon	a C-note
a cock-and-bull story	a coffee table book
a cold day in Hell	a cold day in July
a cold fish	a cold piece of work
a cold snap	a Colonel Blimp
a committee is a group of men who keep minutes and	have a fit
a contradiction in terms	a conversation piece
a cool customer	a cool head
a copy	Cosby sweater
a couch potato	a coup de grâce
a cradle-robber	a cradle-snatcher
a credibility gap	a crock
a cross to bear	a crow to pluck
a crowd-puller	a cry-baby