To make French in character or style; to adopt or adapt to French customs, language, or manner.
From 'French' plus the verb-forming suffix -ize. Essentially synonymous with 'frenchify,' using an alternative suffix to create a verb meaning the same thing.
English gave itself multiple ways to say 'become French' (frenchify, frenchize, frenchification)—this shows how languages add different suffixes to the same root to create small variations in meaning and style!
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