The initial idioms of the letter A

a red cent	a red eye
a red flag to a bull	a red herring
red-letter day	red light
red man	a red rag to a bull
red wine	redeye
red-flag term	red herring
a red-letter day	refrigerator mother
regular brick	a reign of terror
reign of terror	a Renaissance man
Renaissance man	a rent boy
rent boy	return to form
a revolving door	revolving door syndrome
revolving door	a rich seam
Richard Roe	rich seam
a riddle, wrapped in a mystery, inside an enigma	a riddle wrapped in an enigma