WordReference Random House Unabridged Dictionary of American English © 2026
flap′ door′, 
    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.
    • 1835–45

'flap door' also found in these entries (note: many are not synonyms or translations):
falling door - tepee

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