jackknife
(dʒæknaɪf )
Word forms: jackknifes, jackknifing, jackknifed
intransitive verb
If a truck that is in two parts jackknifes, the back part swings around at a sharp angle to the front part in an uncontrolled way as the truck is moving.
Traffic on the Pacific Highway near Yatala was delayed early yesterday after a semi-trailer jackknifed and left the road.
Image of jackknife
© Tochanchai, Shutterstock
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