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.
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.
"jackknife" into Turner's path, striking her vehicle head-on.
As I tried a jackknife dive from my tiptoes, a huge wave engulfed me just as I took a breath to submerge.
A jackknife, right off the porch, and an Olympic-style swim for the opposite shore.
Next to them, even the best of the jackknife legs and splayed-out lifts on "Dancing With the Stars" or "So You Think You Can Dance" look like horrifying mutations from Planet Schlock.
Over 50 years in the woods I have never needed more than some bandaids, a small bottle of betadine, a few 4x4 gauze sponges, a small folded piece of duct tape, a jackknife, and a needle.
The man took a jackknife from his suit pocket and severed a single rose from the bush by the door.
"We do not even have a jackknife here, but we will not let Israeli soldiers on board this ship," IHH leader Bulent Yildirim told reporters via a live video stream before the convoy set sail from Cyprus.