a large pocket knife with a folding blade
a dive in which the diver bends from the waist, touches the ankles without bending the knees, and straightens out before hitting the water
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| 单词 | jackknife |
| 释义 | jackknife1noun (pl jackknives)a large pocket knife with a folding blade a dive in which the diver bends from the waist, touches the ankles without bending the knees, and straightens out before hitting the water jackknife2verb transto double up like a jackknife to cause to jackknife to cause (something) to double up like a jackknife to double up like a jackknife said of an articulated lorry: to go out of control so that the trailer swings round to form a V-shape and ends up at an angle of 90 degrees or less to the tractor of a diver: to perform a jackknife |
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