birr

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

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