whirring

verb
  1. 1

    To move or vibrate (something) with a buzzing sound.

  2. 2

    To make a sibilant buzzing or droning sound.

  3. 3

    To cause (something) to make such a sound.

noun
  1. 1

    A whirr, the sounds of a whirr.

Source: https://en.wiktionary.org/wiki/whirr, https://en.wiktionary.org/wiki/whirring