Definition of "jack-knifes" []

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

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• "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."