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jackknife
(redirected from Jack-knife)

   Also found in: Dictionary/thesaurus, Wikipedia 0.03 sec.
jackknife
1. a knife with the blade pivoted to fold into a recess in the handle
2. a former name for a type of dive in which the diver bends at the waist in midair, with his legs straight and his hands touching his feet, finally straightening out and entering the water headfirst: forward pike dive


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