whirr

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From Middle English whirren, probably from Old Norse: compare Danish hvirre, virre, Norwegian kvirre, Old Norse hvirfla (“to whirl, spread”).

To move or vibrate (something) with a buzzing sound.
intransitive To make a sibilant buzzing or droning sound. In a city where media companies and hospitals have armed guards, this accessibility is unusual. Inside, drivers sit and chat in between shifts, the overhead fan whirring and causing the dim electric light to flicker over their faces.
transitive To cause (something) to make such a sound.
intransitive (of a panther) To make a vibrating sound in its throat when contented, much like the domestic cat’s purr.

A sibilant buzz or vibration; the sound of something in rapid motion. As Jane turned from the telephone she heard the whirr of a motor. That would be the children coming home from school. The car called for them at the playground every afternoon at five.
A bustle of noise and excitement.
The vibrating sound made by a panther in its throat when contented.