To make something or someone quiet; to reduce noise or calm someone down.
From 'quiet' (Latin 'quietus' meaning 'at rest') plus the suffix '-en' (to make). Common in British English, less common in American English which prefers 'quiet' as a verb.
English speakers created this word because 'quiet' felt like it needed to be an action verb—we built '-en' endings onto tons of adjectives (darken, harden, soften) showing how our brains create grammar patterns.
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