The initial idioms of the letter A

sweet cherry	a sweet deal
a sweet tooth	a sword of Damocles hangs over head
a sword of Damocles hangs over (one's) head	a tête à tête
table scrap	a tad
tag team	a tall drink of water
a tall story	a tangled web
Target run	a taste of (one's) own medicine
temper tantrum	a tempest in a teakettle
a tempest in a teapot	a ten
test bed	a thick skin
a thing of beauty is a joy forever	a thing of the past
a think-tank	thorn in side
thorn in (one's) side	a thorn in side
thorn in the flesh	thorn in (someone's) side
a thought	a three-alarm fire