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

 

behind

 noun
noun
BrE BrE//bɪˈhaɪnd//
 
; NAmE NAmE//bɪˈhaɪnd//
 
 
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(informal) a person’s bottom. People often say behind to avoid saying bottom. synonym backside The dog bit him on his behind. Word Origin Old English behindan, bihindan, from bi ‘by’ + hindan ‘from behind’.
See the Oxford Advanced American Dictionary entry: behind