The initial idioms of the letter A

Johnny-come-lately	a Johnny-come-lately
a journey of a thousand miles begins with a single	a joy to behold
judgment call	a judgment call
a kangaroo court	a kept man
a kernel of truth	a kick at the can
a kick at the cat	a kick in the butt
a kick in the teeth	a kick up the arse
a kind of	a kind of (something)
a kind word for everybody	a kindred soul
a kindred spirit	a king's ransom
a kissing cousin	a knee-slapper
a knife in the back	a knight in shining armor
a knight in shining armour	knock-shop
a knocking shop	know-all
know-it-all	know-nothing