definition of
whir

[1] #1 whir n. [whirr, whirring, birr] sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers". wn

[2] #2 whir v. [whizz, whiz, whirr, birr, purr] make a soft swishing sound; "the motor whirred"; "the car engine purred". wn