British present participle of apostatise; the act of renouncing or abandoning one's religion or beliefs.
Present participle of 'apostatise' (British spelling), formed by adding '-ing' to the verb stem, parallel to American 'apostatizing'.
During the English Reformation, chroniclers documented 'apostatising clergy'—priests openly leaving the Catholic Church—which was shocking because they'd taken vows that were supposed to be unbreakable.
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