repent

from The Century Dictionary.

• To feel pain, sorrow, or regret for something one has done or left undone.
• Especially, to experience such sorrow for sin as produces amendment of life; be grieved over one's past life, and seek forgiveness; be penitent. See repentance.
• To do penance.
• To change the mind or course of conduct in consequence of regret or dissatisfaction with something that is past.
• To express sorrow for something past.
• =Syn. 1–4. See repentance.
• To remember or regard with contrition, compunction, or self-reproach; feel self-accusing pain or grief on account of: as, to repent rash words; to repent an injury done to a neighbor.
• To be sorry for or on account of.
• noun Repentance.
• In botany, creeping; growing prostrate along the ground, or horizontally beneath the surface, and rooting progressively.
• In zoology, creeping, as an animalcule; specifically, of or pertaining to the Repentia.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To feel pain on account of; to remember with sorrow.
• transitive verb To feel regret or sorrow; -- used reflexively.
• transitive verb Archaic To cause to have sorrow or regret; -- used impersonally.
• adjective (Bot.) Prostrate and rooting; -- said of stems.
• adjective (Zoöl.) Same as Reptant.
• intransitive verb To feel pain, sorrow, or regret, for what one has done or omitted to do.
• intransitive verb To change the mind, or the course of conduct, on account of regret or dissatisfaction.
• intransitive verb (Theol.) To be sorry for sin as morally evil, and to seek forgiveness; to cease to love and practice sin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb intransitive To feel pain, sorrow, or regret for what one has done or omitted to do; the cause for repenting may be indicated with "of".
• verb theology, intransitive To be sorry for sin as morally evil, and to seek forgiveness; to cease to love and practice sin.
• verb transitive To feel pain on account of; to remember with sorrow.
• verb transitive To be sorry for, to regret.
• verb archaic, transitive To cause to have sorrow or regret.
• verb obsolete, reflexive To cause (oneself) to feel pain or regret.
• adjective Creeping along the ground.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb turn away from sin or do penitence
• verb feel remorse for; feel sorry for; be contrite about