bidet (n.)youdaoicibaDictYouDict[bidet 词源字典]
1620s, "small horse," from French bidet (16c.), of unknown etymology. Originally in French "a small horse, a pony," thus "a vessel on a low narrow stand, which can be bestridden for bathing purposes," a sense attested in English from 1766.[bidet etymology, bidet origin, 英语词源]