Longman Dictionary of Contemporary English homepage

backside

 noun
     
back‧side [countable] informal
1 the part of your body that you sit on [= bottom]
2

get off your backside

to start doing something or taking action, instead of not doing anything

➔ be a pain in the backside

at pain1 (3)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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