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backside
The definition of backside is the rump of a human or the hind part of an animal.
(noun)If you slip on ice and fall on your rear end, then that is an example of falling on your backside.
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See backside in Webster's New World College Dictionary
noun
- the back or hind part
- the rump; buttocks
Origin: ME bak side
See backside in American Heritage Dictionary 4
noun
Informal
The buttocks; the rump.
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