Jackknife


Jackknife : (1) a. A folding pocket knife. b. A folding action of something upon itself. (2) (Fire Pr) To position an aerial ladder truck tractor at an angle to the trailer to increase its stability when the ladder is raised, esp when the ladder is used in cantilever position (fly unsupported). See also: Jack; Wheel Chocks. (3) (Transp) Accidental doubling of a tractor and trailer truck resulting from a skid
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