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bird's mouth

noun, Carpentry.
a right-angled notch cut in the underside of a rafter for fitting over a longitudinal member, as a wall plate.
Origin of bird's mouth
1815-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • Oliver mildly replied, that he had always heard a birds mouth described by the term in question.

    Oliver Twist, Vol. I (of 3) Charles Dickens

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