Buttocks
来自Big Physics
Safin（讨论 | 贡献）2022年4月28日 (四) 21:07的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=buttocks+etymology&newwindow=1&hl=en ref] Middle English, apparently from butt3 (although…”的新页面）
Middle English, apparently from butt3 (although the earliest evidence is from a later date) + -ock.
etymonline
buttocks (n.)
"the two protuberances which form the rump in men and animals," c. 1300, probably from Old English buttuc "end, short piece of land," from Proto-Germanic *butaz, from PIE root *bhau- "to strike," thus related to butt (n.1).
