A dagger is a weapon, a sharp knife that's used for self-defense or fighting. During the Late Middle Ages, daggers were a sort of back-up to the longer sword, both carried during battles.

Most daggers have a sharp, pointed blade and a handle with a "crossguard" that protects a fighter's hand from sliding forward and getting cut. Throughout history, various kinds of daggers have been used in close combat. The word comes from the Old French dague, though its origin beyond that isn't known. The ancient last name Dagard, dating from the 13th century or earlier, meant "one who carries a dagger."

Definitions of dagger

n a short knife with a pointed blade used for piercing or stabbing

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a relatively long dagger with a straight blade
a ceremonial four-inch curved dagger that Sikh men and women are obliged to wear at all times
crease, creese, kris
a Malayan dagger with a wavy blade
bodkin, poniard
a dagger with a slender blade
a small dagger with a tapered blade
Type of:
a weapon with a handle and blade with a sharp point

n a character used in printing to indicate a cross reference or footnote

Type of:
character, grapheme, graphic symbol
a written symbol that is used to represent speech

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