A dagger is is a fighting knife with a sharp point designed or capable of being used as a thrusting or stabbing weapon.
Over the years, the term 'dagger' has been used to describe a wide variety of thrusting knives, including knives that feature only a single cutting edge, or, in some instances, no cutting edge at all. However, over the last hundred years or so, authorities have recognized that the dagger, in its contemporary or mature form, has come to incorporate certain definable characteristics, including a short blade with a sharply-tapered point, a central spine or fuller, and (usually) two cutting edges sharpened the full length of the blade, or nearly so. Most daggers also feature a full crossguard to keep the hand from riding forwards onto the sharpened blade edges. Another distinctive feature of the modern dagger is that it is designed to position the blade horizontally when using a conventional palm grip, enabling the user to slash right or left as well as thrust the blade between an opponent's ribs.
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