n : sound of something in rapid motion: "whir of a bird's
wings"; "the whir of the propellers" [syn: whir, whirring, birr]
v 1: make a soft swishing sound, as of a motor working or wings
flapping [syn: whizz, whiz, whir, birr, purr]
2: make a vibrant sound, as of some birds [syn: churr]