Definition of "jackknifes" []

• Third-person singular simple present indicative form of jackknife. (verb)

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• "One Friday afternoon, our teacher, Mrs. Thurber, let us have show and tell, and while other kids brought in jackknifes and rock collections, I brought my ukulele to class and performed “Singing the Blues” by Guy Mitchell."
• "I saw hundreds, maybe thousands, of holes left by jackknifes and razor clams, but no keyholes."
• "And, in the most resonant strand here, a frazzled twentysomething widow named Lusa Maluf Landowski tries to make a go of her farm after her husband's truck jackknifes."