Birr

v. i.	1.	To make, or move with, a whirring noise, as of wheels in motion. [imp. & p. p. Birred ( ); p. pr. & vb. n. Birring.]
n.	1.	A whirring sound, as of a spinning wheel.
	2.	A rush or impetus; force.

Noun	1.	birr - the basic unit of money in Ethiopia; equal to 100 cents
	2.	birr - sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers" Synonyms: whir, whirr, whirring
Verb	1.	birr - make a soft swishing sound; "the motor whirred"; "the car engine purred" Synonyms: purr, whir, whirr, whiz, whizz

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