Meaning of apostasize in English:

apostasize

Pronunciation /əˈpɒstəsʌɪz/

verb

(also apostasise)
  • To abandon or renounce a religion or religious belief; to move from one faith to another; to become an apostate. In extended use: to abandon a political principle or party.

Origin

Late 17th century. From apostasy + -ize.