disconcert (v.)youdaoicibaDictYouDict[disconcert 词源字典]
1680s, from Middle French disconcerter (Modern French déconcerter) "confused," from dis- "do the opposite of" (see dis-) + concerter (see concert). Related: Disconcerted; disconcerting; disconcertingly.[disconcert etymology, disconcert origin, 英语词源]