whirr

whirr /hw'ɜːr/ (whirrs whirring whirred)
also whir
[VERB] V, V-ing
When something such as a machine or an insect's wing whirrs, it makes a series of low sounds so quickly that they seem like one continuous sound.
The camera whirred and clicked.
...the whirring sound of the film projector.
[N-COUNT] usu sing; SOUND
Whirr is also a noun.
He could hear the whirr of a vacuum cleaner...

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