to apostatize

listen to the pronunciation of to apostatize
Английский Язык - Английский Язык
To give up or renounce one's position or belief
{v} to forsake one's religion or party
abandon one's beliefs or allegiances
To give up or renounce ones position or belief
{f} abandon one's religion, be unfaithful to one's principles (also apostatise)
To renounce totally a religious belief once professed; to forsake one's church, the faith or principles once held, or the party to which one has previously adhered
to apostatize