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flap door

Also called falling door. a door hinged at the bottom so as to fall downward and outward.
a door placed horizontally or on a shallow incline, as an exterior cellar door.
Origin of flap door
1835-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for flap door
Historical Examples
  • In front of each tier of 12 compartments is a flap door opening downward.

    Handwork in Wood William Noyes
  • At the front is a flap door which is kept closed while the torpedo is slipped into its place.

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