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behind

noun [C]
 
 
/bɪˈhaɪnd/ informal

Definition

the part of the body on which a person sits: He tripped and fell on his behind. Why don't you get off your behind (= stand up) and do something! → Synonym bottom nounThe buttocks
(Definition of behind noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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