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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
jackknife is a noun and verb meaning "a large knife with one or more folding blades". It carries 3 recorded senses.
a large knife with one or more folding blades
a dive in which the diver bends to touch the ankles before straightening out
dive into the water bending the body at the waist at a right angle, like a jackknife
sport
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for jackknife come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.