Definition of downer noun from the Oxford Advanced American Dictionary

     

    downer

     noun
    noun
    NAmE//ˈdaʊnər//
     
    (informal)
     
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  1. 1[usually plural] a drug, especially a barbiturate, that relaxes you or makes you want to sleep compare upper
  2. 2an experience that makes you feel sad or depressed Not getting the promotion was a real downer. He's really on a downer (= very depressed).
See the Oxford Advanced Learner's Dictionary entry: downer