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• n  a large knife with one or more folding blades
• n  a dive in which the diver bends to touch the ankles before straightening out
• v  dive into the water bending the body at the waist at a right angle, like a jackknife

• She beat Miss Poynton narrowly in the low-board event, after her opponent's final dive, a running front jackknife with a half twist, caught the judges' eyes.
• Within 18 inches they uncovered first a white handbag, then the body of a young girl, fully dressed, doubled up like a jackknife.
• Bill Moyers of CBS likened the Republican sweep of the South to "a jackknife slicing through a ripe peach.

• clasp knife

News & Articles

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• 3-vehicle collision stalls I-10 West travel Sunday
  HARRISON COUNTY -- Two people were injured Sunday in two rear-end collisions that caused an 18-wheeler to jackknife on the Wolf River Bridge on Interstate 10.
  July 7, 2013 - The Biloxi Sun Herald

Quotes

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• James Krenov in San Francisco Chronicle
  From the time I was 6, I was making my own toys with the jackknife,says Krenov, 88. "It was a joy to me that I could rely on my hands and my eyes to produce things."