To preach the Christian gospel in order to convert people to Christianity.
From 'evangel' (gospel) plus the suffix '-ise/-ize' (to make or practice), creating a verb meaning 'to preach the gospel.' The '-ise' spelling is standard British English; '-ize' is standard American.
The '-ise/-ize' suffix is one of the main spelling differences between British and American English, but both pronunciations sound identical to most English speakers.
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