Definition of "jack-knifes" [jack-knifes]

  • Third-person singular simple present indicative form of jack-knife. (verb)

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Use "jack-knifes" in a sentence
  • "Following it when the big-rig directly in front of you jack-knifes could be fatal."
  • "Agriculture, said that when a wagon or trailer jack-knifes, it is usually because the tractor pulling the wagon could not handle the load."
  • "Just in time the men scatter, as the truck's front end hits the first parked car and the tanker jack-knifes into the other cars."