or trap door
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How to use trapdoor in a sentence
But we reached Camp David in one piece, and there was no trapdoor for Cap.
The explorers soon discovered that the only entrance into the estufa was by a trapdoor and a ladder.Overland|John William De Forest
Jack, the bullets whistling thickly around him, managed to crawl unhurt to the trapdoor and again descend into the courtyard.Jack Harkaway's Boy Tinker Among The Turks|Bracebridge Hemyng
Then, taking him to the top of one of their great houses, they bade him step down through an open trapdoor into a dark chamber.The Story of the Thirteen Colonies|H. A. (Hlne Adeline) Guerber
When this trapdoor is not closed, and food "goes down the wrong way," we choke, and the food is expelled by coughing.
When food is in the course of being swallowed, the upper part of this tube forms a trapdoor over the opening.