whirr
verbUK /wɜː/
US /wɜːr/
To make a soft, buzzing sound like a fan spinning.
The old fan began to whirr as soon as we turned it on.
OTHER MEANINGS
2. A soft buzzing sound made by something spinning fast.
We heard the whirr of the helicopter blades above us.
3. To move quickly with a buzzing sound.
The drone whirred past the window and disappeared.
4. To be very busy or full of activity.
The office whirred with activity before the big meeting.