Birr

Definition:

(v. i.) To make, or move with, a whirring noise, as of wheels in motion.
(n.) A whirring sound, as of a spinning wheel.
(n.) A rush or impetus; force.

Compare birr with other words:

birr vs. knowledge

birr vs. currency

birr vs. trilling

birr vs. thrust

birr vs. momentum

birr vs. impetus

birr vs. energy