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- Noun

A large, strong clasp knife for the pocket; a pocket knife.

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  • Jackknife

    Jackknife may refer to:

  • Jackknife variance estimates for random forest

    In statistics, jackknife variance estimates for random forest are a way to estimate the variance in random forest models, in order to eliminate the bootstrap effects.

  • Jackknife clam

    Jackknife clam is a common name which is used for several species in the genera Ensis and Solen within the family Solenidae, species which are found on Atlantic and Pacific beaches of temperate North America. Species in these families are also found elsewhere in the world, but in other English-speaking countries they usually have other common names. All the species in these genera have thin, highly elongate shells. Many of these bivalves are collected for food.

  • Jack-Knife Gypsy

    Jack-Knife Gypsy

    Jack-Knife Gypsy is the second album from folk rock/country rock musician Paul Siebel.

  • A Jackknife to a Swan

    A Jackknife to a Swan

    A Jackknife to a Swan is the seventh studio album by The Mighty Mighty Bosstones. It was released on July 9, 2002, by SideOneDummy Records. This album marked the band's return to an indie label, and was the last album released by the group before their four-year hiatus between 2003 and 2007. The Mighty Mighty Bosstones would not release their next studio album until Pin Points and Gin Joints in 2009.

  • Jackknife (exercise)

    A jackknife is an abdominal exercise. This exercise is also known as a "V-Up". Jackknife exercises are designed to strengthen the upper and lower abdominal muscles, particularly the transversus abdominis muscle. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles. This exercise can be modified by using a exercise ball. The jackknife can be done by lying flat on your back with your arms extended overhead and your feet raised slightly above the floor. The jackknife is completed by slowly bringing your straight arms toward your hips, and lifting your upper torso off the floor.

  • Jackknife Bascule Bridge

    Jackknife Bascule Bridge

    The Jackknife (or Jack-knife) Bascule Bridge is a bascule bridge that spans the Kaministiquia River at Thunder Bay, Ontario, Canada, to link the city to Mission Island, one of two islands in the Kaministiquia River delta. The bridge was built by the Canadian Pacific Railway between August 1910 and April 1913. The contractor for the abutments and piers was Alexander Charles Stewart (1867–1944). The bridge had two decks, the lower deck for trains and the upper deck for vehicular road traffic.

  • The Jack-Knife Man

    The Jack-Knife Man

    The Jack-Knife Man is a 1920 American silent drama film directed by King Vidor. Prints of the film survive in several film archives.

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