Crossword Clue:

APOLOGISE to express regret

AnswerCrossword Clue
MOANExpress regret
RUEExpress regret
SIGHExpress regret
ATONEFORExpress regret over
RUERSThey're surer to regret
QUITSAGOODTHINGEnds it, to one's subsequent regret?
ORELSE"... if not, you'll live to regret it!"
DEARJOHNLetter of regret to a G.I.
PATCOUnion that didn't live long to regret endorsing Ronald Reagan in 1980
HALE"I only regret that I have but one life to lose for my country" speaker