Definition of upstairs adverb from the Oxford Advanced American Dictionary

      

    upstairs

     adverb
    adverb
    NAmE//ˌʌpˈstɛrz//
     
     
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  1. 1  up the stairs; on or to a floor of a house or other building higher than the one that you are on The cat belongs to the people who live upstairs. I carried her bags upstairs. She went upstairs to get dressed. opposite downstairs
  2. 2(informal) in the mind; mentally She works hard, but she doesn't have much upstairs (= she is not intelligent).
  3. upstairsadjective
     
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  4. NAmE//ˈʌpstɛrz//
     
    [only before noun] an upstairs room
  5. Idioms
    kick somebody upstairs(informal)
     
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    to move someone to a job that seems to be more important but which actually has less power or influence
See the Oxford Advanced Learner's Dictionary entry: upstairs