The initial idioms of the letter A

ate	eat (something or someone) for breakfast
eat (someone's) ass out	eat (one's) gun
eat (one's) own dog food	eat (one's) salt
eat into (something)	eat (one's) words
eat pussy	ate up with someone/something
Athanasian wench	Athens
at home	Tommy Atkins
atmosphere	atomic cocktail
atomic wedgie	atomic
atone for	A-town
at	atta
attach	attach oneself to
attach to	attached
attached to	in force
attack is the best form of defense	attack