jackknife Definition in the Cambridge English Dictionary
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Definition of “jackknife” - English Dictionary

Definition of "jackknife" - American English Dictionary

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jackknifenoun [C]

 us   /ˈdʒækˌnɑɪf/

jackknife noun [C] (KNIFE)

a ​knife with one or more ​blades that ​fold into the ​handle, which ​fits into a person’s ​pocket

jackknifeverb [I]

 us   /ˈdʒækˌnɑɪf/

jackknife verb [I] (MAKE AN ANGLE)

to ​bend in ​half, or ​bend so the ​parts make a ​sharpangle: A ​truck jackknifed on Route 80 this ​morning.
(Definition of jackknife from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "jackknife" - British English Dictionary

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jackknifeverb [I]

uk   us   /ˈdʒæk.naɪf/
If a ​truck that has two ​parts jackknifes, one ​partmoves around so ​far towards the other ​part that it cannot be ​driven: The ​oiltanker jackknifed after ​skidding on the ​ice.

jackknifenoun [C]

uk   us   /ˈdʒæk.naɪf/ (plural jackknives)
a ​largeknife with a ​blade that ​folds into the ​handle
(Definition of jackknife from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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