or trap door
Origin of trapdoor
Examples from the Web for trapdoor
But we reached Camp David in one piece, and there was no trapdoor for Cap.
Then he strode away, stepped through the trapdoor, began to descend, disappeared.Children of the Market Place|Edgar Lee Masters
The words rushed out as if through a trapdoor she could not control.The Black Tide|Arthur G. Stangland
At the end of twenty minutes they discovered a sort of trapdoor, and heard weak and inarticulate cries arise from beneath it.The Trappers of Arkansas|Gustave Aimard