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 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 of flap door