Find another word for jackknife. In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for jackknife, like: pocketknife, clasp-knife, case-knife, Barlow knife, double-up, double-over, fold, fold-up, twist, crash and be wrecked.
Now, when's the last time you saw that jackknife Claudia gave you last summer?
This particular machine supports your head, neck, shoulders, and body, allowing you to safely engage in the "jackknife" position that is commonly associated with abdominal workout routines without strain or stress on other body parts.
Slowly jackknife your body upwards as you roll the ball down towards your feet.
jackknife position and was given full muscle relaxation.