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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.