birr /ˈbɝ, ˈbɪr/
 衝量


 Birr v. i. [imp. & p. p. Birred p. pr. & vb. n. Birring.]  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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 birr
      n 1: the basic unit of money in Ethiopia; equal to 100 cents
      2: sound of something in rapid motion; "whir of a bird's
         wings"; "the whir of the propellers" [syn: whir, whirr,
          whirring]
      v : make a soft swishing sound; "the motor whirred"; "the car
          engine purred" [syn: whizz, whiz, whirr, whir, purr]