What does jack-knife mean?

Definitions for jack-knife

Here are all the possible meanings and translations of the word jack-knife.


  1. jack-knife(Noun)

    A compact folding knife.

    He kept a jack-knife in his pocket for various tasks.

  2. jack-knife(Noun)

    The front-dive pike, in which the body folds and unfolds.

    It took me hundreds of dives to master even the simple jackknife

  3. jack-knife(Verb)

    To fold in the middle, as a jackknife does.

    The cat jackknifed in the air and landed gracefully on its feet.

  4. jack-knife(Verb)

    To cause a semi-trailer truck to fold like a jackknife in a traffic accident.


  1. Chaldean Numerology

    The numerical value of jack-knife in Chaldean Numerology is: 1

  2. Pythagorean Numerology

    The numerical value of jack-knife in Pythagorean Numerology is: 7

Images & Illustrations of jack-knife

  1. jack-knifejack-knifejack-knife


Find a translation for the jack-knife definition in other languages:

Select another language:

Discuss these jack-knife definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:     


Use the citation below to add this definition to your bibliography:


"jack-knife." Definitions.net. STANDS4 LLC, 2018. Web. 25 Apr. 2018. <https://www.definitions.net/definition/jack-knife>.

Are we missing a good definition for jack-knife? Don't keep it to yourself...

Nearby & related entries:

Alternative searches for jack-knife:

Thanks for your vote! We truly appreciate your support.