Definition of "whirr"
verb:
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To move or vibrate (something) with a buzzing sound.
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To make a sibilant buzzing or droning sound.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
To cause (something) to make such a sound.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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noun:
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A sibilant buzz or vibration; the sound of something in rapid motion.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A bustle of noise and excitement.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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