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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.
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Word History and Origins
Origin of bird's mouth1
First recorded in 1815–25
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Example Sentences
Oliver mildly replied, that he had always heard a birds mouth described by the term in question.
From Project Gutenberg
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