1. 
   jackknife
   [n] - a dive in which the diver bends to touch the ankles before straightening out 2. [v] - dive into the water bending the body at the waist at a right angle, like a jackknife
   Found op http://www.webdictionary.co.uk/definition.php?query=jackknife
   
   
2. 
   Jackknife
   Jack'knife` noun A large, strong clasp knife for the pocket; a pocket knife.
   Found op http://www.encyclo.co.uk/webster/J/1
   
   
3. 
   jackknife
   noun a dive in which the diver bends to touch the ankles before straightening out
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=jackknife
   
   
4. 
   jackknife
   verb dive into the water bending the body at the waist at a right angle, like a jackknife
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=jackknife
   
   
5. 
   Jackknife
   • (n.) A large, strong clasp knife for the pocket; a pocket knife.
   Found op http://thinkexist.com/dictionary/meaning/jackknife/
   
   
6. 
   jackknife
   
   1. a large knife with one or more folding blades
   2. a dive in which the diver bends to touch the ankles before straightening out
   
   Found op
   
   
7. 
   Jackknife
   A jackknife or jack knife, is a large pocket knife with a folding blade (a clasp-knife).
   Found op http://www.probertencyclopaedia.com/browse/FJ.HTM
   
   
8. 
   Jackknife
   [exercise] A jackknife is an abdominal exercise. == See also == ...
   Found op http://en.wikipedia.org/wiki/Jackknife_(exercise)
   
   
9. 
   jackknife
   1) Certain dive 2) Clasp knife 3) Dive 4) Dive of a sort 5) Dive that involves touching the toes 6) Diving maneuver 7) High-dive move 8) Pocket knife 9) Pocketknife 10) Semi hazard 11) Serious accident
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/jackknife/1
   
   
10. 
    jacksknife
    1) Paar's parer?
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/jacksknife/1
    
    

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