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Wiktionary
jackknifing

vb. (present participle of jackknife English)

Wikipedia
Jackknifing

Jackknifing means the folding of an articulated vehicle i.e. one towing a trailer, such that it resembles the acute angle of a folding pocket knife. If a vehicle towing a trailer skids, the trailer can push from behind until it spins around and faces backwards. This may be caused by equipment failure, improper braking, or adverse road conditions such as an icy road surface. In extreme circumstances, a driver may attempt to jackknife the vehicle deliberately in order to halt it following brake failure.

Usage examples of "jackknifing".

He lashed out with his right leg, centralizing the weight of his torso and head, bending the knee of the extended leg in midair, jackknifing his foot out at the last possible instant, unfolding it into the man's middle section.

Half of the demons were already jackknifing over, building up their own speed to cut in alongside Walker's group as they cut through.

He burst through decreasing water pressure and out into the air, jackknifing, suspended in spray, fixing the city with a cunning eye.

Faintly, the boy saw one hand flailing for the dropped stick, and with a jackknifing lunge, he kicked it out of reach.