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Related to valves: butterfly valves, ball valves, Valves of the heart, Control valves

safety valve

An activity that one does to release strong feelings (such as stress) in a healthy or positive way. Golf has become my safety valve—when I'm really stressed about work, I make sure to schedule a tee time.
See also: safety, valve

a safety valve

a way of allowing someone to express strong or negative emotions without harming other people (often + for ) I often think football acts as a safety valve for a lot of stored-up male aggression.
See also: safety, valve