Pronunciation: /ˈdʒækˌnaɪf/
noun a large, strong, pocketknife
A1 I saw a jackknife on the ground while walking in the park.
A2 The camper used a jackknife to cut some rope for the tent.
B1 The diver performed a perfect jackknife dive off the high diving board.
B2 The chef skillfully used a jackknife to fillet the fish.
C1 The carpenter always carries a jackknife in his toolbox for quick and easy cutting.
C2 The survival expert demonstrated how to use a jackknife for various tasks in the wilderness.
verb to perform a dive in which the body is bent at the waist and the legs are brought up over the head
A1 He jackknifed his body to avoid hitting the obstacle.
A2 The truck jackknifed on the icy road, causing a traffic jam.
B1 The diver jackknifed off the diving board with perfect form.
B2 The gymnast jackknifed in mid-air before landing gracefully.
C1 The acrobat jackknifed through the hoop with incredible precision.
C2 The professional diver jackknifed off the platform with amazing skill and control.
formal The diver executed a perfect jackknife off the high diving board.
informal I tried to do a jackknife off the pool edge but ended up belly flopping instead.
slang That guy just did a sick jackknife off the cliff!
figurative The company's profits took a jackknife dive after the scandal was exposed.
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