trapdoor

noun
UK /ˈtræp.dɔːr/
US /ˈtræp.dɔːr/

A trapdoor is a small door in a floor or ceiling that you can open and close.

The pirate lifted the trapdoor and climbed down into the secret room.


OTHER MEANINGS

2. A hinged or sliding cover over an opening in a stage floor, used for surprise entrances.

The magician vanished through a trapdoor in the stage.

3. A door in a roof or ceiling that gives access to the space above.

They stored old boxes behind the trapdoor in the attic.

4. In computing, a secret way to get into a system that bypasses normal security.

The programmers found a trapdoor that let them in without a password.