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Jackknife
01
a dive in which the diver bends to touch the ankles before straightening out
02
a large knife with one or more folding blades
to jackknife
01
contrary to rule or accepted order or general practice
02
dive into the water bending the body at the waist at a right angle, like a jackknife
03
(of articulated vehicles such as tractor trailer) to experience a loss of control where the front and rear parts of the vehicle fold together
