apostatize

• apostatise

From apostate +‎ -ize.

apostatize (third-person singular simple present apostatizes, present participle apostatizing, simple past and past participle apostatized)

1. To give up or renounce one's position or belief.
   • 1857, Herman Melville, chapter XXVI, in The Confidence-Man: His Masquerade:

     Soft enticements of domestic life too often draw him from the ascetic trail; a monk who apostatizes to the world at times.

• commit apostasy, apostasize