The initial idioms of the letter A

a horse of another	a horse of another color
a horseback opinion	a hostage to fortune
a hot button	a hot hand
a hot mess	a hot number
a hot potato	a hot spot
a house divided against itself cannot stand	a house is not a home
a house of cards	house of ill repute
a household name	huckleberry above a persimmon
huckleberry above (one's) persimmon	a hue and cry
a hush fell over	A into G
a jack of all trades	jack off
a Jack the Lad	a jaundiced eye
a je ne sais quoi	a Jekyll and Hyde
jerk off	a Jill of all trades is a master of none
a job lot	a Job's comforter