Definition of behind noun from the Oxford Advanced American Dictionary

     

    behind

     noun
    noun
    NAmE//bɪˈhaɪnd//
     
    (informal)
     
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  1. 1a person's buttocks. People often saybehindto avoid sayingbuttocks. synonym backside
  2. 2 The dog bit him on his behind.
See the Oxford Advanced Learner's Dictionary entry: behind