antithesis (n.)youdaoicibaDictYouDict[antithesis 词源字典]
1520s, from Late Latin antithesis, from Greek antithesis "opposition, resistance," literally "a placing against," also a term in logic and rhetoric, noun of action from antitithenai "to set against, oppose," a term in logic, from anti- "against" (see anti-) + tithenai "to put, place" (see theme).[antithesis etymology, antithesis origin, 英语词源]