The initial idioms of the letter A

a/ place in the sun	a/ smart mouth
a (real) frog-choker	a (real) frog-strangler
a (real) toad-choker	a (real) toad-strangler
a (sudden) rush of blood (to the head)	a (ticking) time bomb
a (whole) new ballgame	babe in arms
a babe in the woods	a baby boomer
baby bump	back order
back up	back and forth
a back-handed compliment	a backroom boy
a backseat driver	a bad carpenter blames his tools
a bad egg	a bad excuse is better than none
bad hair day	a bad penny
a bad penny always turns up	a bad time
A bad workman blames his tools	a bag lady
a bag of bones	bait and switch