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Definition of safety valve noun from the Oxford Advanced American Dictionary

     

    safety valve

     noun
    noun
     
     
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  1. 1a device that lets out steam or pressure in a machine when it becomes too great
  2. 2a harmless way of letting out feelings of anger, excitement, etc. Exercise is a good safety valve for the tension that builds up at work.
See safety valve in the Oxford Advanced Learner's Dictionary
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