THESAURUS
plead guilty
acknowledge, admit, admit everything, allow, apologize, avow, beg pardon, come clean, concede, confess, cop a plea, do penance, grant, let on, open up, out with it, own, own up, reform, repent, spill, spill it, spit it out, tell all, tell the truth, think better of
ROGET THESAURUS
plead guilty
Penitence
VB
repent, be sorry for, be penitent, rue, regret, think better of, recant, knock under,
plead guilty, sing miserere, sing de profundis, cry peccavi, own oneself in the wrong, acknowledge, confess, (disclose), humble oneself, beg pardon, turn over a new leaf, put on the new man, turn from sin, reclaim, repent in sackcloth and ashes, (do penance), learn by experience.