A boot knife or a gambler's dagger is a small fixed-blade knife (usually, a dagger) that is designed to be carried in or on a boot. Typically, such a knife is worn on a belt or under a pant leg. If worn around the neck (by means of a chain or lanyard) they become a neck knife. Boot knives generally come with a sheath that includes some form of a clip. Most have double-edged blades, like a dagger, that range from 3 to 5 inches (7.62 to 12.7 cm).
A boot-knife carries with it a multitude of legal issues, as each defining factor is likely to cause legal trouble in certain jurisdictions. Some regions prohibit carrying fixed-blade knives, double edged knives (dirk or dagger), concealed knives, or knives over certain length.
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