booby hatch

The definition of a booby hatch is a cover over a small hatch on a ship, or a slang term for an institution for the mentally ill.

(noun)

  1. An example of booby hatch is what sailors might cover up on a boat.
  2. An example of booby hatch is an offensive term for a place for the mentally ill.

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See booby hatch in Webster's New World College Dictionary

  1. a covering over a small hatchway on a ship
  2. Slang an institution for the mentally ill

See booby hatch in American Heritage Dictionary 4

noun
  1. Nautical A raised covering over a small hatchway.
  2. Offensive Slang An institution for the mentally ill.
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