Definition of backside noun from the Oxford Advanced Learner's Dictionary

 

backside

 noun
noun
BrE BrE//ˈbæksaɪd//
 
; NAmE NAmE//ˈbæksaɪd//
 
(informal)
 
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  • the part of the body that you sit on synonym behind, bottom Get up off your backside and do some work!
  • Idioms
    a pain in the neck(British English also a pain in the arse/backside)(North American English also a pain in the ass/butt)
     
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    (informal) a person or thing that is very annoying
    See the Oxford Advanced American Dictionary entry: backside

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