Dagger
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A dagger is a fighting knife typically with a very sharp point and usually one or two sharp edges, typically designed or capable of being used as a cutting or thrusting weapon. Daggers have been used
The Fairbairn–Sykes fighting knife, a modern-day dagger
A bronze dagger from Lorestan, Iran, 2600–2350 BCE
A Neolithic dagger from the Muséum de Toulouse
Pre-Roman Iberian iron dagger forged between the middle of the 5th and the 3rd century BC
Fighting knife
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A fighting knife has a blade designed to most effectively inflict injury in close-quarters physical confrontations. The combat knife and the trench knife are examples of military fighting knives.
Dagger
…A dagger is a fighting knife typically with a very sharp point and usually one or two sharp edges, typically designed or capable of being used as a cutting or thrusting weapon…
An assortment of fighting knives
Top: Bowie Knife c. 1850s Bottom: Naval Bowie Knife c. 1860s
M1918 Trench Knife
U.S. Marine KA-BAR Knife