Definition of backside noun from the Oxford Advanced American Dictionary

     

    backside

     noun
    noun
    NAmE//ˈbæksaɪd//
     
    (informal)
     
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  1. 1the part of the body that you sit on synonym behind synonym bottom
  2. 2 Get up off your backside and do some work!
See the Oxford Advanced Learner's Dictionary entry: backside