Trapdoor

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A trapdoor is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof.^[1] It is traditionally small in size.^[2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time.^[3] The trapdoor has played a pivotal function in the operation of the gallows, cargo ships, trains,^[4] booby traps,^[5] and more recently theatre and films.^[6][7]