Vichy (adj.)youdaoicibaDictYouDict[Vichy 词源字典]
in reference to collaborationist government of France, 1940, from the name of the city in department of Allier in central France, famous for mineral springs, seat 1940-44 of the French government formed under Nazi occupation and headed by Pétain. The place name is of uncertain origin.[Vichy etymology, Vichy origin, 英语词源]