Upside
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 07:59的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=upside+etymology&newwindow=1&hl=en ref] Middle English: originally up so down, perhaps in…”的新页面）
Middle English: originally up so down, perhaps in the sense ‘up as if down’.
etymonline
upside (n.)
1610s, "upper side or surface," from up (adj.) + side (n.). Adverbial phrase upside (someone's) head in reference to a blow to the head is recorded from 1970, African-American vernacular.
