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flap door

noun
1.
Also called falling door. a door hinged at the bottom so as to fall downward and outward.
2.
a door placed horizontally or on a shallow incline, as an exterior cellar door.
Origin
1835-1845
1835-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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9
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