The initial idioms of the letter A

be a slave to (something)	are all over
be as high as a kite	be as honest as the day is long
be behind the times	be economical with the truth
be for the best	be for the high jump
be going great guns	be going spare
in at the deep end	be in clover
be in deep water	be a license to print money
be like a child in a sweetshop	be like Fort Knox
be losing it	be not long for this world
not be lost on (someone)	not something to write home about
be not what it's cracked up to be	be not worth a brass farthing
be off the hook	be one brick short of a (full) load
be one card short of a full deck	be one card shy of a (full) deck
be one flesh	be one in a million
be one in the eye for	be one of a kind