American English

Definition of jackknife verb from the Oxford Advanced American Dictionary



[intransitive]Verb Forms present simple I / you / we / they jackknife
he / she / it jackknifes
past simple jackknifed
-ing form jackknifing
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to form a V-shape. For example, if a truck that is in two parts jackknifes, the driver loses control and the back part moves toward the front part.
See the Oxford Advanced Learner's Dictionary entry: jackknife

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