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definitions
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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.
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Origin of flap door

First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for flap door

Historical Examples

  • The other part of the shop is closed by a flap-door that does not show on the picture.

    Topsy-Turvy Land

    Samuel M. Zwemer

  • In the side of his wagon cover next to me was a flap-door, which, the day being fine, was fastened open.