Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun jackknife

2 senses of jackknife

Sense 1
clasp knife, jackknife -- (a large knife with one or more folding blades)
       => pocketknife, pocket knife -- (a knife with a blade that folds into the handle; suitable for carrying in the pocket)

Sense 2
jackknife -- (a dive in which the diver bends to touch the ankles before straightening out)
       => dive, diving -- (a headlong plunge into water)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb jackknife

1 sense of jackknife

Sense 1
jackknife -- (dive into the water bending the body at the waist at a right angle, like a jackknife)
       => dive -- (plunge into water; "I was afraid to dive from the board into the pool")