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English definition of “backside”

backside

noun [C] (BODY)    /ˈbæk.saɪd/ informal
the part of the body that you sit on: After cycling for the whole day, my backside was very sore. → Synonym bottom nounThe buttocks
(Definition of backside noun (BODY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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