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| birr [ bur ] |
transitive and intransitive verb (past and past participle birred, present participle bir·ring, 3rd person present singular birrs) |
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make whir: to make a whirring sound, or cause something to make a whirring sound
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noun (plural birrs) |
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whir: a whirring sound
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| [14th century. < Old Norse byrr "favorable wind"] |
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