birr

Noun
  1. The basic unit of money in Ethiopia;
    Equal to 100 cents (synset 113686501)
  2. Sound of something in rapid motion (synset 107414517)
    "whir of a bird's wings"; "the whir of the propellers"
Verb
  1. Make a soft swishing sound (synset 202193033)
    "the motor whirred"; "the car engine purred"

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