British spelling of apostatize; to renounce or abandon one's religion, political allegiance, or core beliefs.
From 'apostate' with the verb-forming suffix '-ise' (British English), while American English uses '-ize'. Both forms derive from the Greek 'apostatēs'.
British and American English split on this word—the Brits use '-ise' endings while Americans use '-ize'—but both spellings come straight from Greek and mean exactly the same thing: to abandon your faith.
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