forfeit, purge, sacrifice, purify, cleanse, redress, flagellate, rectify, make good, beg (forgiveness), fast, confess, plead (forgiveness), make amends, put right, confess (sin or guilt), express (remorse), atone for (guilt or sin), do penance, surrender (to a higher power), return to (god), do penance for, redeem oneself, expiate, compensate for, make restitution for, make reparation for