lugworm (n.)youdaoicibaDictYouDict[lugworm 词源字典]
c. 1600, from lug, probably a Celtic word (the first recorded use is in a Cornwall context) unrelated to lug (n.) or lug (v.) + worm. But OED suggests connection with lug (v.) on the notion of "heavy, clumsy."[lugworm etymology, lugworm origin, 英语词源]