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jackknife definitions

WordNet (r) 3.0 (2005)

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

Merriam Webster's

I. noun Date: 1711 1. a large strong pocketknife 2. a dive executed headfirst in which the diver bends from the waist and touches the ankles while holding the knees unbent and then straightens out II. verb Date: 1806 transitive verb 1. to cut with a jackknife 2. to cause to double up like a jackknife intransitive verb 1. to double up like a jackknife <jackknifed into a seat beside me, folding up his six feet eight Lady Bird Johnson> 2. to turn and form an angle of 90 degrees or less with each other used especially of a tractor-trailer combination

Oxford Reference Dictionary

n. & v. --n. (pl. -knives) 1 a large clasp-knife. 2 a dive in which the body is first bent at the waist and then straightened. --v.intr. (-knifed, -knifing) (of an articulated vehicle) fold against itself in an accidental skidding movement.

Webster's 1913 Dictionary

Jackknife Jack"knife`, n. A large, strong clasp knife for the pocket; a pocket knife.

Collin's Cobuild Dictionary

see jack-knife

Moby Thesaurus

adz, ax, belly buster, belly flop, belly whopper, bread knife, bushwhacker, butcher knife, cannonball, carving knife, chaser, chisel, cleaver, clipper, clippers, crash dive, dagger, dive, drop, fall, gainer, gouge, hack, hatchet, header, hoe, hunting knife, knife, lance, lancet, letter-opener, machete, mattock, nippers, nose dive, paper cutter, paper knife, parachute jump, paring knife, penknife, pick, pickax, pitch, plowshare, plunge, pounce, power dive, razor, razor blade, running dive, saw knife, sax, scalpel, scissors, scoop, scraper, scuffle hoe, scythe, share, shears, sheath knife, sickle, sidecutters, sky dive, snips, spear, spokeshave, stationary dive, stoop, surgical knife, swan dive, swoop, sword, table knife, wedge

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