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Noun jackknife has 2 senses
  1. clasp knife, jackknife - a large knife with one or more folding blades
    --1 is a kind of pocketknife, pocket knife
  2. jackknife - a dive in which the diver bends to touch the ankles before straightening out
    --2 is a kind of     dive, diving
    Derived form: verb jackknife1
,Verb jackknife has 1 sense
  1. jackknife - dive into the water bending the body at the waist at a right angle, like a jackknife
    --1 is one way to     dive
    Derived form: noun jackknife2
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
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