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