Usually means: Folding knife, truck accident maneuver.
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We found 28 dictionaries that define the word jackknife:

General (22 matching dictionaries)
  1. jackknife: Merriam-Webster
  2. jackknife: Oxford Learner's Dictionaries
  3. jackknife: American Heritage Dictionary of the English Language
  4. jackknife: Collins English Dictionary
  5. jackknife: Vocabulary.com
  6. Jackknife, jackknife: Wordnik
  7. jackknife: Wiktionary
  8. jackknife: Webster's New World College Dictionary, 4th Ed.
  9. jackknife: The Wordsmyth English Dictionary-Thesaurus
  10. jackknife: Infoplease Dictionary
  11. Jackknife, jackknife: Dictionary.com
  12. jackknife: Cambridge Essential American English Dictionary
  13. Jackknife (disambiguation), Jackknife (exercise), Jackknife (statistics), Jackknife (truck tractor and trailer), Jackknife: Wikipedia, the Free Encyclopedia
  14. Jackknife: Online Plain Text English Dictionary
  15. jackknife: Webster's Revised Unabridged, 1913 Edition
  16. jackknife: Rhymezone
  17. Jackknife: AllWords.com Multi-Lingual Dictionary
  18. jackknife: FreeDictionary.org
  19. jackknife: Mnemonic Dictionary
  20. jackknife: TheFreeDictionary.com

Business (1 matching dictionary)
  1. Glossary of Trucking Terms (No longer online)

Computing (1 matching dictionary)
  1. jackknife: Encyclopedia

Science (2 matching dictionaries)
  1. Jackknife: Eric Weisstein's World of Mathematics
  2. GLOSSARY OF ORDINATION-RELATED TERMS (No longer online)

Slang (1 matching dictionary)
  1. jackknife: Urban Dictionary

Sports (1 matching dictionary)
  1. Extreme Martial Arts Glosary (No longer online)

(Note: See jackknifes as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (statistics) A resampling method that applies estimators to all subsamples that each omit a single different group (possibly of a single datapoint) of the original sample to provide a sample distribution of the estimate.
noun:  Alternative spelling of jack-knife [A compact folding knife.]
verb:  Alternative form of jack-knife [To fold in the middle, as a jackknife does.]

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