dart (v.)youdaoicibaDictYouDict[dart 词源字典]
late 14c., "to pierce with a dart," from dart (n.). Meaning "to move like a dart" is attested from 1610s. Related: Darted; darter; darting.[dart etymology, dart origin, 英语词源]
tunny (n.)youdaoicibaDictYouDict
large sea-fish of the mackerel order, 1520s, probably from Middle French thon (14c.), from Old Provençal ton and directly from Latin thunnus "a tuna, tunny," from Greek thynnos "a tuna, tunny," possibly with a literal sense of "darter," from thynein "dart along."