whirr

Noun
  1. Sound of something in rapid motion (synset 107414517)
    "whir of a bird's wings"; "the whir of the propellers"
    is a type of: sound - the sudden occurrence of an audible event
    same as: birr, whir, whirring
Verb
  1. Make a soft swishing sound (synset 202193033)
    "the motor whirred"; "the car engine purred"
    is a type of: go, sound - make a certain noise or sound
    same as: birr, purr, whir, whiz, whizz
  2. Make a vibrant sound, as of some birds (synset 201054434)
    is a type of: emit, let loose, let out, utter - express audibly; utter sounds (not necessarily words)
    same as: churr

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