Safety valve

What is Safety valve ?

Safety valve is (noun) 1. a valve which allows liquid, gas or steam to escape if the pressure becomes too high There was a loud hiss from the safety valve as steam es- caped from the boiler. 2. a flap in the heart or other organ which opens and closes to allow liquid to pass in one direction only 3. an ac- tivity which allows people to get angry or ex- cited without causing any harm These meetings act as a safety valve for employees to complain about the management.

 

source: Easier English, Student Dictionary Upper Intermediate Level