Safety-valve

safety valve

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:
1805–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
safety valve
 
n
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 10th Edition
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