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Verb: apostatise  u'pós-tu,tIz
Usage: Brit (N. Amer: apostatize)
  1. Abandon one's beliefs or allegiances
    "the apostle shows that if a true Christian were to apostatise, nothing would remain for him but the terrific prospect of eternal condemnation";
    - apostatize, tergiversate

Derived forms: apostatising, apostatises, apostatised

Type of: disown, renounce, repudiate

Encyclopedia: Apostatise