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Definition of "jackknife" []

  • A large clasp knife. (noun)
  • Sports A dive in the pike position, in which the diver straightens out to enter the water hands first. (noun)
  • To fold or double (something or oneself) like a jackknife. (verb-transitive)
  • To cut or stab with a jackknife. (verb-transitive)
  • To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road. (verb-intransitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "jackknife" in a sentence
  • "To rephrase Steve McIntyre if he will forgive me the jackknife is the statistical technique of resampling by running the estimate on subsamples of N-q from a sample of N then averaging the results."
  • ""jackknife" - Version: 2.4.2, 8/10/2009 08: 58PM PST"
  • "That caused one of those vehicles to "jackknife" into the lane of traffic that Turner was driving in, striking her vehicle head-on."