noun, plural jack·knives.
verb (used without object), jack·knifed, jack·knif·ing.
verb (used with object), jack·knifed, jack·knif·ing.
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Words nearby jackknife
Example sentences from the Web for jackknife
She cut it with Henry's jackknife into four quarters, and she and Henry took the two crusty ends themselves.The Box-Car Children|Gertrude Chandler Warner
It was a rather battered jackknife, and Scattergood noticed that one blade had been broken off.
Mr. Blossom drew a jackknife from his pocket and began leisurely to sharpen a pencil.
Then he got up, jerked Mr. Blossom's old jackknife from the post where it had been abandoned, and pocketed it.
"I've heard tell you kin cut real gold like cheese," he said, and opened his jackknife.