herd (n.)youdaoicibaDictYouDict[herd 词源字典]
Old English heord "herd, flock," from Proto-Germanic *herdo- (cognates: Old Norse hjorð, Old High German herta, German Herde, Gothic hairda "herd"), from PIE *kerdh- "a row, group, herd" (cognates: Sanskrit śárdhah "herd, troop," Old Church Slavonic čreda "herd," Greek korthys "heap," Lithuanian kerdžius "shepherd"). Herd instinct in psychology is first recorded 1908.[herd etymology, herd origin, 英语词源]