jack-knife

1. A compact folding knife.

   He kept a jack-knife in his pocket for various tasks.

   Klappmesser, Taschenmesser

   складно́й ножskladnój nož

2. The front-dive pike, in which the body folds and unfolds.

   It took me hundreds of dives to master even the simple jackknife.

3. An abdominal exercise where knees and torso are raised from a lying position.

   Klappmesser

4. (colloquial)A semi-trailer truck accident in which the vehicle mimics the closing of a jack-knife.

   I have seen several jack-knives along that dangerous stretch of road.

5. A game of skill played with a pocket knife in which participants try to throw or flip the knife to stick upright in the ground at specified points or areas.

regular

• jackknifealternative