jack knife
英
美
- jack n.千斤顶；插座；船首旗；男人；公畜vt.用千斤顶顶起；抬高n.杰克（男子名）n.扑克牌里的Jn.水手；侍者
- knife n.刀v.用刀切割
名词 jackknife:
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a large knife with one or more folding blades
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a dive in which the diver bends to touch the ankles before straightening out
动词 jackknife:
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dive into the water bending the body at the waist at a right angle, like a jackknife
