Definition of 'birr'

Noun

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"
      Synonyms: whir whirr whirring

Verb

1. make a soft swishing sound; "the motor whirred"; "the car engine purred"
      Synonyms: whizz whiz whirr whir purr

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