junk (n.1)youdaoicibaDictYouDict[junk 词源字典]
"worthless stuff," mid-14c., junke "old cable or rope" (nautical), of uncertain origin, perhaps from Old French junc "rush, reed," also used figuratively as a type of something of little value, from Latin iuncus "rush, reed" (but OED finds "no evidence of connexion"). Nautical use extended to "old refuse from boats and ships" (1842), then to "old or discarded articles of any kind" (1884). Junk food is from 1971; junk art is from 1966; junk mail first attested 1954.[junk etymology, junk origin, 英语词源]