transitive. To renounce, abjure (one's faith, God, etc.). Also intransitive.

In the direction of retreat. (Commonly back.) †to go backward: to recede, retreat; to relapse, backslide (obsolete).

intransitive. To abandon or renounce one's religious faith or moral practice; to apostatize. Frequently with from.

intransitive. To abandon or renounce one's religious faith, to apostatize. Obsolete.

to turn (one's) tippet: to change one's course or behaviour completely; in bad sense, to act the turncoat or renegade. Obsolete.

intransitive. To fall back into error, sin, or wrongdoing; spec. to return to heresy after recantation (now rare). Frequently with into; occasionally…

To slide back, in a figurative sense; to fall away from attained excellence, esp. of religious faith and practice; to relapse.

= apostatize, v.

To abandon or renounce one's religious faith or moral allegiance; to become an apostate.

intransitive. To abandon one's religion, party, etc.; to become a renegade. Frequently with from.

intransitive. To abandon or renounce a religion or religious belief; to move from one faith to another; to become an apostate. In extended use…

intransitive. To abandon one's religion, party, etc.; = renegade, v.

intransitive. To renounce one's faith; to commit apostasy. rare.