Bum noun - The fleshy part of the human body that you sit on.
Buttocks is a synonym for bum in bottom topic. In some cases you can use "Buttocks" instead a noun "Bum", when it comes to topics like arse, butt, tail. popular alternative
Buttocks noun - The part of the body upon which someone sits.
Usage example: she slipped in the mud puddle and hit the ground square on her buttocks
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