jackknife
Noun:
- A type of dive: A dive in which the diver bends at the waist to touch the ankles or shins with the hands before straightening the body to enter the water.
- A type of knife: A large pocketknife with one or more folding blades.
Verb:
- To perform a jackknife dive: To dive into the water by bending the body sharply at the waist, as in the jackknife dive.
- To fold or bend sharply: (Especially of an articulated vehicle like a truck and trailer) to fold or bend at a sharp angle, typically in an uncontrolled way during an accident.
Noun (Dive): The Olympic diver executed a perfect jackknife from the 10-meter platform. Her best dive is the jackknife, where she tucks tightly before entering the water.
Noun (Knife): He used his sturdy jackknife to cut the rope. The old sailor always carried a jackknife in his pocket.
Verb (Dive): The swimmer will jackknife off the starting block. She practiced for hours to learn how to jackknife correctly.
Verb (Vehicle accident): The truck's brakes failed, causing it to jackknife across the icy highway. When the trailer skidded, the entire rig began to jackknife.
- "to jackknife" (intransitive verb, vehicle): This is a specialized but common usage describing the dangerous folding action of a long vehicle.
- Figurative use for bending: While less common, it can describe any sharp, angular bend.
- Pocketknife (noun): A more general term for a small folding knife. A jackknife is a specific, often larger, type of pocketknife.
- Swiss Army knife (noun): A proprietary brand of multi-tool pocketknife.
- Jackknifing (noun/gerund): The action or process of a vehicle jackknifing.
- For the dive: Pike dive (a similar but not identical diving position where the body is bent at the hips with legs straight).
- For the knife: Folding knife, clasp knife.
- For the vehicle action: Fold, hinge, buckle (in this specific context).
(This word does not commonly form phrasal verbs.)
(There are no common idioms using the word "jackknife.")
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a dive in which the diver bends to touch the ankles before straightening out
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a large knife with one or more folding blades
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dive into the water bending the body at the waist at a right angle, like a jackknife
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