whirr

Noun	1.	whirr - sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers" Synonyms: whir, whirring, birr
Verb	1.	whirr - make a soft swishing sound; "the motor whirred"; "the car engine purred" Synonyms: birr, purr, whir, whiz, whizz
	2.	whirr - make a vibrant sound, as of some birds Synonyms: churr

birr, go, purr, sound, whir, whirring, whiz, whizz