Meaning of “jackknife” in the English Dictionary

"jackknife" in American English

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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 sharp angle:

A truck jackknifed on Route 80 this morning.

(Definition of “jackknife” from the Cambridge Academic Content Dictionary © Cambridge University Press)