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Meaning of word jackknife from English dictionary with examples, synonyms and antonyms.

jackknife   noun

Meaning : A large knife with one or more folding blades.

Synonyms : clasp knife

Meaning : A dive in which the diver bends to touch the ankles before straightening out.

jackknife   verb

Meaning : Dive into the water bending the body at the waist at a right angle, like a jackknife.