Birr (?), v. i. [imp. & p. p. Birred (#); p. pr. & vb. n. Birring.] [Cf. OE. bur, bir, wind, storm wind, fr. Icel. byrr wind. Perh. imitative.]
To make, or move with, a whirring noise, as of wheels in motion.
© Webster 1913.
Birr, n.
1.
A whirring sound, as of a spinning wheel.
2.
A rush or impetus; force.
© Webster 1913.