Henry did so, and Jack took his jack-knife out of his pocket, and they both set to work.
He had left his half-axe in camp, and when he felt in his pocket for his jack-knife it was not there.
He was far too long for his bed, and to accommodate his superfluous length his knees were bent up like a jack-knife.
Bet ye a jack-knife he'll be spreein' it fer all he's wuth to-morrow.
Besides this—for in poverty of appliances so complete everything counts for a little—he had his jack-knife in his pocket.
He pulled out his jack-knife and pushed it into the fog, clean to the handle.
A boy of fifteen could buy a syringe as easily as he could buy a jack-knife.
Cutter, with his jack-knife, parted the reins just back of the bit.
He let the toad fall to the ground, needing both hands to draw the blade of his jack-knife.
A piece of board is grooved with a jack-knife in the manner shown in the diagram.
also jackknife, large pocket knife, 1711, probably American English, "perh[aps] associated with some sense of JACK sb.1, but cf. jackleg knife" [OED]; see jack + knife (n.). Jackleg was a U.S. colloquial term of contempt from c.1850. On another theory, so called because it originally was associated with sailors. As a kind of swimming dive, from 1922. As a type of tractor-trailer accident, 1966. Both from the notion of folding, as the knife does.
1776, "to stab," from jack-knife (n.). Intransitive meaning "to fold or bend" the body is said to date from the time of the American Civil War. The truck accident verbal sense is from 1949. Related: Jackknifed; jackknifing.