Search Result for "jackknife": 
Wordnet 3.0

NOUN (2)

1. a large knife with one or more folding blades;
[syn: clasp knife, jackknife]

2. a dive in which the diver bends to touch the ankles before straightening out;


VERB (1)

1. dive into the water bending the body at the waist at a right angle, like a jackknife; 



The Collaborative International Dictionary of English v.0.48:

Jackknife \Jack"knife`\, n.
   A large, strong clasp knife for the pocket; a pocket knife.
   [1913 Webster]


WordNet (r) 3.0 (2006):

jackknife
    n 1: a large knife with one or more folding blades [syn: clasp
         knife, jackknife]
    2: a dive in which the diver bends to touch the ankles before
       straightening out
    v 1: dive into the water bending the body at the waist at a
         right angle, like a jackknife