cub (n.)youdaoicibaDictYouDict[cub 词源字典]
1520s, cubbe "young fox," of unknown origin; perhaps from Old Irish cuib "whelp," or from Old Norse kobbi "seal." Extended to the young of bears, lions, etc., after 1590s. The native word was whelp. Cub Scout is from 1922.[cub etymology, cub origin, 英语词源]