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:
1815–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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The grub matures in the throat of the bird, and eggs wash into the water from the bird's mouth when feeding.
Place a paper towel in the bird's mouth and a plastic bag with a rubber band seal over its head.
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