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The Collaborative International Dictionary of English v.0.48 (gcide)

Apostatize \A*pos"ta*tize\, v. i. [imp. & p. p. {Apostatized};
p. pr. & vb. n. {Apostatizing}.] [LL. apostatizare.]
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.
[1913 Webster]

He apostatized from his old faith in facts, took to
believing in ?emblances. --Carlyle.
[1913 Webster]