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Definition of upper noun from the Oxford Advanced American Dictionary

     

    upper

     noun
    noun
    NAmE//ˈʌpər//
     
    [usually plural]
     
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  1. 1the top part of a shoe that is attached to the sole shoes with leather uppers
  2. 2(informal) a drug that makes you feel excited and full of energy compare downer
See upper in the Oxford Advanced Learner's Dictionary
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