jackknife Meaning in Cambridge American English Dictionary
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Meaning of "jackknife" - American English Dictionary

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 sharp angle: A truck jackknifed on Route 80 this morning.
(Definition of jackknife from the Cambridge Academic Content Dictionary © Cambridge University Press)
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