hobnail (n.)youdaoicibaDictYouDict[hobnail 词源字典]
1590s, the first element probably identical with hob "rounded peg or pin used as a mark or target in games" (1580s), of unknown origin. See hob. Because they were used to make rough shoes, the word was used figuratively for "rustic person" 17c. and after. Related: Hobnailed.[hobnail etymology, hobnail origin, 英语词源]