Jackknife - Meaning, Definition & English Examples
A jackknife is a small folding knife with a blade that pivots into the handle. It is also a diving position where the body bends at the waist and then straightens.
Definition:
A folding pocketknife, or a dive where the body bends at the waist and then straightens.
Synonyms:
pocketknife, clasp knife, penknife
Part of Speech:
noun, verb
Antonyms:
straighten, unfold
Common Collocations:
jackknife dive, jackknife position, jackknife truck
Derivatives:
jackknifed, jackknifing
Usage Tips:
Use "jackknife" as a noun for the knife or dive; as a verb for bending sharply (e.g., a truck trailer).
Common Phrases:
jackknife into the pool, jackknifed trailer, sharp as a jackknife
Etymology:
Originates from "Jack" (generic name) + "knife," referring to its common use and folding mechanism.
Examples:
- 1. He pulled out a jackknife to cut the rope.
- 2. The diver performed a perfect jackknife off the high board.
- 3. The truck's trailer jackknifed on the icy road.
- 4. She keeps a small jackknife in her backpack for camping trips.