either of the two round soft parts at the top of a person’s legs 屁股的一边；臀部 
He fell down hard on his right buttock and slid along the path. 他狠狠摔倒在右臀部，沿着小路滑落。
Oxford Collocations Dictionaryadjective- firm
- rounded
- bare
- …
Word OriginOld English buttuc, probably from the base of butt ‘thicker end of something’ + -ock.
