A·pos·ta·tize v. i. [imp. & p. p. Apostatized p. pr. & vb. n. Apostatizing.] 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.
He apostatized from his old faith in facts, took to believing in ░emblances. --Carlyle.
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