A compact folding knife. / The front-dive pike, in which the body folds and unfolds. / (colloquial) A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.

To fold in the middle, as a jackknife does. / (colloquial) To cause a semi-trailer truck to fold like a jackknife in a traffic accident.

(originally) An earthenware container, either with two or no handles, for holding oil, water, wine, etc., or used for burial.

(transitive) To preserve (food) in a jar.

(countable) A clashing or discordant set of sounds, particularly with a quivering or vibrating quality.

(transitive) To knock, shake, or strike sharply, especially causing a quivering or vibrating movement. / (transitive) To harm or injure by such action. / (transitive, figuratively) To shock or surprise.

an article of protective clothing that is designed to keep the wearer's head floating above the surface of the water.

(US, dated) An old, dilapidated or unpretentious automobile. / (US, dated, slang) A hip, cool, groovy automobile.

(intransitive) To talk rapidly, indistinctly, or unintelligibly; to utter gibberish or nonsense. / (transitive) To utter rapidly or indistinctly; to gabble.

Rapid or incoherent talk, with indistinct utterance; gibberish.