To make a loud, continuous whirring or churring sound; to make noise like a churn or mechanical device.
Possibly imitative or onomatopoetic in origin, related to the sound of churning or continuous mechanical noise, with possible Old English roots in words describing turning or whirring sounds.
Onomatopoeia like 'churm' shows how English speakers mimic sounds with words—and some words have survived for centuries just because they sound like what they describe, making them incredibly satisfying to say!
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