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English definition of “backside”

backside

noun [C] uk   /ˈbæk.saɪd/ informal us  

backside noun [C] (BODY)

the part of the body that you sit on: After cycling for the whole day, my backside was very sore.
Synonym
The buttocks

backside noun [C] (BACK PART)

Indian English the back part of something: On the backside of this building you will find a door. Do not write anything on the backside of your answer book.
(Definition of backside from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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