Definition of jackknife verb from the Oxford Advanced Learner's Dictionary

 

jackknife

 verb
verb
BrE BrE//ˈdʒæknaɪf//
 
; NAmE NAmE//ˈdʒæknaɪf//
 
Verb Forms present simple I / you / we / they jackknife
BrE BrE//ˈdʒæknaɪf//
 
; NAmE NAmE//ˈdʒæknaɪf//
 
he / she / it jackknifes
BrE BrE//ˈdʒæknaɪfs//
 
; NAmE NAmE//ˈdʒæknaɪfs//
 
past simple jackknifed
BrE BrE//ˈdʒæknaɪft//
 
; NAmE NAmE//ˈdʒæknaɪft//
 
past participle jackknifed
BrE BrE//ˈdʒæknaɪft//
 
; NAmE NAmE//ˈdʒæknaɪft//
 
-ing form jackknifing
BrE BrE//ˈdʒæknaɪfɪŋ//
 
; NAmE NAmE//ˈdʒæknaɪfɪŋ//
 
Motoring problems and accidents
 
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[intransitive] to form a V-shape. For example if a lorry/truck that is in two parts jackknifes, the driver loses control and the back part moves towards the front part. See related entries: Motoring problems and accidents
See the Oxford Advanced American Dictionary entry: jackknife

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