jackknife verb - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of jackknife verb from the Oxford Advanced American Dictionary

jackknife

verb

NAmE//ˈdʒæknaɪf//

[intransitive]Verb Forms present simple I / you / we / they jackknife

he / she / it jackknifes

past simple jackknifed

-ing form jackknifing

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.

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