Definition

1. Noun:
   • A hinged or sliding door in a floor or ceiling: A trap door is a door that is set into a horizontal surface, such as a floor, stage, or ceiling. It is designed to be opened to allow access to a space below or above, and then closed to blend in with the surrounding surface.

Usage Examples

• Noun:
  • The magician disappeared through a trap door in the stage.
  • We need to access the crawl space through the trap door in the hallway floor.
  • The old castle had a trap door leading to a secret dungeon.

Advanced Usage

• "to fall through a trap door": To experience a sudden, unexpected failure or downfall, often used metaphorically.
  • His political career fell through a trap door after the scandal.
• "trap door function": In mathematics and computer science, a function that is easy to compute in one direction but difficult to reverse without special information (a "key"). This is a metaphorical extension of the physical concept.
  • Modern encryption relies on trap door functions to secure data.

Variants and Related Words

• Trapdoor (noun): A common alternative spelling, written as one word.
  • The script called for a trapdoor on the set.
• Hatch (noun): A similar opening, often in a deck, roof, or aircraft, but not necessarily a full door with hinges.
• Trapdoor spider (noun): A type of spider that builds a burrow with a hinged lid made of silk and soil.

Synonyms

• Hatchway: An opening, often with a cover, in a deck or floor.
• Access panel: A removable section in a wall, floor, or ceiling for maintenance access.

Related Phrases

• Trap door effect: A sudden, surprising revelation or event, akin to something emerging from a trap door.
  • The final chapter had a real trap door effect, completely changing the story.

Related Idioms

• Like a trap door opening: Describing something that happens very suddenly and surprisingly.
  • His resignation came like a trap door opening, shocking everyone in the company.

Noun

1. a hinged or sliding door in a floor or ceiling