jackknife

• POS: Noun, Verb (intransitive)
• HYPHEN: jack=knife

CIDE DICTIONARY

jackknife, n. 

 A large, strong clasp knife for the pocket; a pocket knife.  [1913 Webster]

OXFORD DICTIONARY

jackknife, 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.

THESAURUS

jackknife

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