safety valve noun
plural ∼ valves [count] 1 : a part in a machine that opens automatically to release steam, water, gas, etc., when pressure becomes too great 2 : something that allows someone to release mental stress and tension in a harmless way
▪ His hobbies act as a safety valve, relieving some of the pressure he feels from his job.
▪ His hobbies act as a safety valve, relieving some of the pressure he feels from his job.
