cur (n.)youdaoicibaDictYouDict[cur 词源字典]
early 13c., curre, earlier kurdogge used of both vicious dogs and cowardly dogs, probably from Old Norse kurra or Middle Low German korren both echoic, both meaning "to growl." Compare Swedish dialectal kurre, Middle Dutch corre "house dog."[cur etymology, cur origin, 英语词源]