A continuous buzzing or humming sound like spinning machinery, or to make such a sound.
From Middle English 'whirren,' an imitative word imitating the sound itself. Related to 'whirr' and appears across Germanic languages as onomatopoeia.
Hummingbirds create their distinctive whirring sound by flapping their wings 50+ times per second—some species can hit 200 wing beats per second, which is why bees and hummingbirds seem to vibrate rather than actually fly.
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