escape valve
noun
plural escape valves
: safety valve
This dive watch's helium escape valve is conveniently located at 10 o'clock, so you and your watch can easily decompress as you surface.—Lianna Sisinni
Sandia Mountain is more than a picturesque backdrop to Albuquerque … . It is an escape valve for a booming Sunbelt city.—James Brooke
Dreaming is the psyche's escape valve …—Seth Morgan
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Merriam-Webster unabridged
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