Definition of jackknife verb from the Oxford Advanced American Dictionary

 

jackknife

 verb
verb
NAmE//ˈdʒæknaɪf//
 
[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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