Meaning of BUTTOCK in English

BUTTOCK

/ ˈbʌtək; NAmE / noun

[ usually pl. ] either of the two round soft parts at the top of a person's legs

—picture at body

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WORD ORIGIN

Old English buttuc , probably from the base of butt thicker end of something + -ock .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.