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