dagger

Origin

From Middle English daggere, daggare, dagard, probably adapted from Old French dague (1229), related to Occitan, Italian, Spanish daga, Dutch dagge, German Degen, Middle Low German dagge (“knife's point”), Old Norse daggarðr, Danish daggert, Faroese daggari, Welsh dager, dagr, Breton dac, Albanian thikë (“a knife, dagger”), thek (“to stab, to pierce with a sharp object”). In English attested from the 1380s. The ultimate origin of the word is unclear. Grimm suspects Celtic origin. Others have suggested derivation from an unattested Vulgar Latin *daca "Dacian [knife]", from the Latin adjective dācus.