flap door

noun

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

First recorded in 1835–45

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

At the front is a flap door which is kept closed while the torpedo is slipped into its place.
The Romance of War Inventions | Thomas W. Corbin
In the side of his wagon cover next to me was a flap-door, which, the day being fine, was fastened open.
In the Early Days along the Overland Trail in Nebraska Territory, in 1852 | Gilbert L. Cole
In front of each tier of 12 compartments is a flap door opening downward.
Handwork in Wood | William Noyes
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

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