heeler (n.)youdaoicibaDictYouDict[heeler 词源字典]
1660s, "one who puts heels on shoes and boots," agent noun from heel (n.1). Meaning "unscrupulous political lackey," U.S. slang, 1877, from the notion of one who follows at the heels of a political boss, no doubt coined with the image of a dog in mind. See heel (v.1).[heeler etymology, heeler origin, 英语词源]