Duo
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 13:39的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=duo+etymology&newwindow=1&hl=en ref] late 16th century (in duo (sense 2)): via Italian fr…”的新页面）
late 16th century (in duo (sense 2)): via Italian from Latin duo ‘two’.
wiktionary
From French duo or Italian duo, from Latin duo(“two”), from Proto-Indo-European *dwóh₁. Doublet of two, from Proto-Indo-European.
etymonline
duo (n.)
1580s, "song for two voices, duet," via either Italian or French from Latin duo "two" (from PIE root *dwo- "two"). Meaning "two people" (especially as an entertainment team) attested by 1887.
