From The Collaborative International Dictionary of English v.0.48 [gcide]:
Birr \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.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Birr \Birr\, n.
1. A whirring sound, as of a spinning wheel.
[1913 Webster]
2. A rush or impetus; force.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
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}, {birr}]
v 1: make a soft swishing sound; "the motor whirred"; "the car
engine purred" [syn: {whizz}, {whiz}, {whirr}, {whir},
{birr}, {purr}]
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