ATONE, atone for; expiate; propitiate; make amends, make good; reclaim, redeem, repair, ransom, absolve, purge, shrive, do penance, stand in a white sheet, repent in sackcloth and ashes.
set ones house in order, wipe off old scores, make matters up; pay the forfeit, pay the penalty.
APOLOGIZE, express regret, beg pardon, faire lamende honorable [F.], give satisfaction; get -, fall- down on ones knees, - marrowbones [slang or jocular].