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.

2. a harmless outlet for emotion, tension, etc.

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

Word History and Origins

Origin of safety valve¹

First recorded in 1805–15

Example Sentences

In that incident, the board’s investigation found multiple safety failures, including a severely eroded safety valve that allowed flammable gases to dangerously seep into unwanted areas.

From Los Angeles Times

A safety valve had been removed from the pipes for maintenance.

From BBC

Elon Musk thinks humankind’s only safety valve is to move multitudes to Mars.

From Los Angeles Times

The garment sector, which employs 750,000 people, has been a crucial social safety valve, giving steady incomes to Cambodia's poorest.

From BBC

Any CO2 pipelines in Kern County will be equipped with automatic safety valves, which are expected to limit leakage in the event of a rupture.

From Los Angeles Times