'whirr' definitions:
Definition of 'whirr'
(from WordNet)
noun
Sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers" [syn: whir, whirr, whirring, birr]
verb
Make a soft swishing sound; "the motor whirred"; "the car engine purred" [syn: whizz, whiz, whirr, whir, birr, purr]
verb
Make a vibrant sound, as of some birds [syn: churr, whirr]