jackal (n.)youdaoicibaDictYouDict[jackal 词源字典]
c. 1600, from Turkish çakal, from Persian shaghal, from or cognate with Sanskrit srgala-s, literally "the howler." Figurative sense of "skulking henchman" is from the old belief that jackals stirred up game for lions.[jackal etymology, jackal origin, 英语词源]
skulk (v.)youdaoicibaDictYouDict
c. 1200, from a Scandinavian source such as Norwegian skulke "to shirk, malinger," Danish skulke "to spare oneself, shirk," Swedish skolka "to shirk, skulk, slink, play truant." Common in Middle English but lacking in 15c.-16c. records; possibly reborrowed 17c. Related: Skulked; skulking; skulker; skulkery.