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Jackknife may refer to:

• Pocketknife or jackknife, a compact, foldable knife
• Jackknife Bar, Portland, Oregon, U.S.
• Jackknifing, a type of crash with articulated vehicle combinations

Film and television

• Jacknife, a 1989 American film by David Jones
• "Jack Knife", an episode of NCIS
• Jackknife, a character on Superjail!

Athletics and sports

• Jackknife (exercise), an abdominal exercise
• Jackknife, a kicking move involving 540-degree rotation
• Jackknife, a type of high dive
• Jackknife hold, a pinning move in professional wrestling

Other uses

• Jackknife (statistics), a resampling technique in statistics
• Jackknife clam, common name for several species of bivalve mollusc

See also

• Jackknife Bascule Bridge, a bridge in Thunder Bay, Ontario, Canada
• The Jack-Knife Man, a 1920 film

• Disambiguation pages