safety valve

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noun
  1. a device that, when actuated by a gas or vapor pressure above a predetermined level, opens and allows the gas or vapor to escape until its pressure is reduced to a pressure equal to or below that of the predetermined level.Compare relief valve.
  2. a harmless outlet for emotion, tension, etc.

Origin of safety valve

First recorded in 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for safety valve

outlet

Examples from the Web for safety valve

Historical Examples of safety valve


British Dictionary definitions for safety valve

safety valve

noun
  1. a valve in a pressure vessel that allows fluid to escape when a predetermined level of pressure has been reached
  2. a harmless outlet for emotion, energy, tension, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012