Definitions from Wiktionary (safety valve)

▸ noun:  A valve set to open at a pressure below that at which a container holding a gas, vapour, etc. (such as a boiler or pressure cooker), would burst, thus reducing the pressure; a relief valve.
▸ noun:  (by extension) A valve set to close a container holding a gas or vapour to prevent excessive loss of pressure.
▸ noun:  (figuratively) Any mechanism offering relief from physical or emotional pressure or tension.
▸ noun:  (US, law) A United States law, codified at 18 United States Code §3553(f), authorizing a judge to disregard mandatory minimum sentences for some criminals with few or no prior offenses.
▸ verb:  Alternative form of safety-valve [Sometimes followed by off:]




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