from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A large clasp knife.
- n. Sports A dive in the pike position, in which the diver straightens out to enter the water hands first.
- transitive v. To fold or double (something or oneself) like a jackknife.
- transitive v. To cut or stab with a jackknife.
- intransitive v. To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road.
- intransitive v. To form a 90° angle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative spelling of jack-knife.
- n. 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.
- v. Alternative spelling of jack-knife.
from the GNU version of the Collaborative International Dictionary of English
- n. A large, strong clasp knife for the pocket; a pocket knife.
from The Century Dictionary and Cyclopedia
- n. A pocket-knife larger than a penknife.
- n. A horn-handled clasp-knife with a laniard, worn by seamen.
- n. A form of terminal used for making connections in central telephone-stations. See jack, 11 .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. dive into the water bending the body at the waist at a right angle, like a jackknife
- n. a large knife with one or more folding blades
- n. a dive in which the diver bends to touch the ankles before straightening out
Sorry, no etymologies found.