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Definition of jackknife : A large, strong clasp knife for the pocket; a pocket knife.

Synonyms:

Barlow knife, clasp knife, case knife

grindstone, punch, band saw, sickle, miter box, hedge trimmer, file, level, shears, square, hatchet, chain saw, crosscut saw, cold chisel, spoke shave, pliers, tool, lug wrench, hacksaw, spade, wedge, stapler, calipers, keyhole saw, auger, bow saw, shovel, wrecking bar, sledgehammer, claw hammer, emery wheel, screwdriver, chisel, trowel, monkey wrench, welder, handsaw, crowbar, ball-peen hammer, snips, back saw, scythe, saw, spanner, scissors, machete, planer, coping saw, tire iron, vise, grapnel, radial arm saw, jigsaw, scroll saw, hammer, circular saw, edger, wrench, axe, pipe wrench, drill, mallet, awl, pickax, bench drill, buzz saw, arc welder, jointer, table saw, drill press, tin snips, hoe, knife, posthole auger, plane, lathe, pick, ripsaw, gouge

Usage examples:

• " We'll have to be cuttin' one, and with a jackknife, too, for we've nothin' else. - "The Widow O'Callaghan's Boys", Gulielma Zollinger.
• It was a willow whistle of curious construction, with white lines criss- cross on it; and beside it lay a jackknife with a broken blade. - "Hillsboro People", Dorothy Canfield.
• His diminutive but compact and sturdy little form was decorated with his scout jackknife hanging from his belt, his compass dangling from his neck, and his belt ax dragging down his belt in back. - "Pee-wee Harris", Percy Keese Fitzhugh.