safety valve

  1. an automatic valve for a steam boiler, pressure cooker, etc., which opens if the pressure becomes excessive
  2. any outlet for the release of strong emotion, energy, etc.

See safety valve in American Heritage Dictionary 4

noun
  1. A valve in a pressure container, as in a steam boiler, that automatically opens when pressure reaches a dangerous level.
  2. An outlet for the release of repressed energy or emotion.

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safety valve

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