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jackknife

1 of 2

noun

jack·​knife ˈjak-ˌnīf How to pronounce jackknife (audio)
1
: a large strong pocketknife
2
: a dive executed headfirst in which the diver bends from the waist and touches the ankles while holding the knees unbent and then straightens out

jackknife

2 of 2

verb

jackknifed; jackknifing; jackknifes

intransitive verb

1
: to double up like a jackknife
jackknifed into a seat beside me, folding up his six feet eight Lady Bird Johnson
2
: to turn and form an angle of 90 degrees or less with each other
used especially of a tractor-trailer combination

transitive verb

1
: to cause to double up like a jackknife
2
: to cut with a jackknife

Example Sentences

Verb The truck jackknifed on the icy road.
Recent Examples on the Web
Noun
The driver, a 41-year-old man from Mexico, lost control of the semi-truck in the rainy conditions, which caused the vehicle to jackknife and collide with the right shoulder wall, said Castro. City News Service, San Diego Union-Tribune, 24 Dec. 2021 Not having to worry much about containment, his signature inside jackknife move took Cousins off his spots. Ellis L. Williams, cleveland, 3 Oct. 2021 The final three moves are core crushers: the jackknife, boat pose hold, and push-up to opposite toe tap. Christa Sgobba, SELF, 29 Apr. 2021 On the East Coast, from Canada to South Carolina, the Atlantic jackknife clam (also called a razor clam, but smaller than the Pacific variety) is sought in intertidal bays and estuaries. Popular Science, 19 Oct. 2020 In one of his average workout classes, Curtis Adams will lead his group through a series of exercises, including jogging, jackknives and cardio boxing. Olivia Lloyd, chicagotribune.com, 19 Sep. 2019 In one of his average workout classes, Curtis Adams will lead his group through a series of exercises, including jogging, jackknives and cardio boxing. Olivia Lloyd, chicagotribune.com, 19 Sep. 2019 In one of his average workout classes, Curtis Adams will lead his group through a series of exercises, including jogging, jackknives and cardio boxing. Olivia Lloyd, chicagotribune.com, 19 Sep. 2019 In one of his average workout classes, Curtis Adams will lead his group through a series of exercises, including jogging, jackknives and cardio boxing. Olivia Lloyd, chicagotribune.com, 19 Sep. 2019
Verb
The driver of the commercial vehicle attempted to take evasive action which caused the truck-tractor and semi-trailer to jackknife across all the westbound lanes of the Interstate. Kelli Smith, Dallas News, 16 Apr. 2021 The interesting-looking roofline flows back into a ducktail spoiler with slim taillights that jackknife down the quarter panel. Connor Hoffman, Car and Driver, 9 Mar. 2021 The new model meets new, stronger crash-worthiness standards and is designed not to jackknife — guarding against the kind of derailment that killed eight people when Amtrak 188 took a turn too fast near Philadelphia in 2015. CBS News, 11 June 2019 Oftentimes, jackknifing is a result of improper braking, poor road conditions or equipment failure. Kimberly Rapanut, azcentral, 11 June 2018 The truck subsequently jackknifed and slid across all lanes of traffic, leading to the shutdown of the westbound side for a full eight hours. Carol Cormaci, latimes.com, 9 Apr. 2018 On Twitter, State Police said tractor-trailers were jackknifed at various locations in central Massachusetts. Laney Ruckstuhl And Elise Takahama, BostonGlobe.com, 13 Mar. 2018 Swiveling, jackknifing, raising her arms, and then crumpling over, Dunst has as much intensity as a Martha Graham dancer. Amy Larocca, The Cut, 8 Aug. 2017 See More

Word History

First Known Use

Noun

1683, in the meaning defined at sense 1

Verb

1886, in the meaning defined at intransitive sense 2

Time Traveler
The first known use of jackknife was in 1683

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