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bum
noun
The buttocks; the part of the body on which one sits. Primarily used in British English.
Etymology
Origin: Middle English
Root: bom (buttocks) — "cow, ox"
Example
"The teacher told the restless children to sit quietly on their bums during story time."
Usage Notes
Commonly used in British English in a somewhat informal and less crude manner compared to 'butt' or 'ass' in American English. Often used in casual conversation or in reference to children. Phrases like 'sit on your bum' are typical. Understood in other English dialects but may sound more childish.