daggeryoudaoicibaDictYouDict[dagger 词源字典]
dagger: [14] Dagger has an uncertain history. There was a verb dag in Middle English, meaning ‘stab’, which suggests that dagger may simply be ‘something that stabs’, but similarity of form and sense indicates a connection too with Old French dague ‘dagger’. This appears to have come via Old Provençal or Old Italian daga from a hypothetical Vulgar Latin *daca, which meant literally ‘Dacian knife’ (from Latin Dācus ‘Dacian’). Dacia was the ancient name for an area roughly corresponding to modern Romania.
[dagger etymology, dagger origin, 英语词源]
dagger (n.)youdaoicibaDictYouDict
late 14c., apparently from Old French dague "dagger," from Old Provençal dague or Italian daga, which is of uncertain origin; perhaps Celtic, perhaps from Vulgar Latin *daca "Dacian knife," from the Roman province in modern Romania. The ending is possibly the faintly pejorative -ard suffix. Attested earlier (1279) as a surname (Dagard, presumably "one who carried a dagger"). Also compare dogwood. Middle Dutch dagge, Danish daggert, German Degen also are from French.