from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A compact folding knife.
- n. The front-dive pike, in which the body folds and unfolds.
- n. A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.
- n. Alternative spelling of jackknife.
- v. To fold in the middle, as a jackknife does.
- v. To cause a semi-trailer truck to fold like a jackknife in a traffic accident.
Sorry, no etymologies found.