Apedia

Whirr Participle Whir Wɜː Wɜːr Verb Past Tense

Front whirr
Back whirr, whir /wɜː $ wɜːr/ verb (past tense and past participle whirred, present participle whirring) [intransitive]
to make a fairly quiet regular sound, like the sound of a bird or insect moving its wings very fast:
Helicopters whirred overhead.
—whirr noun [countable usually singular]:
the whirr of an electric motor

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