a dive in which the diver bends to touch the ankles before straightening out
Verb:
dive into the water bending the body at the waist at a right angle, like a jackknife
例句
用作不及物动词 (vi.)
The results show that the vehicle tends to rollover on the high friction-coefficient road, while the vehicle tends to yaw and jackknife on the low friction-coefficient road. 结果表明，重型半挂车辆在附着系数较高的良好路面上容易发生侧倾失稳，而在附着系数较低的湿滑路面上则更容易发生横摆和折叠失稳。
美
['dʒæknaɪf]
