"jackknife" in Chinese (Traditional)
摺疊刀（車輛）急彎折疊屈體前翻（跳水動作）
Definition
Jackknife 指刀鋒可以摺入刀柄的摺疊刀。也可指跳水時身體向腰部彎摺，或（如卡車連拖車）在意外中突然折彎。
Usage Notes (Chinese (Traditional))
名詞主要指摺疊刀。動詞常用於描述卡車等在事故中突然折疊（“the truck jackknifed”）。體育領域指具體跳水動作，日常較少用，限於上述語境。
Examples
He always carries a jackknife in his pocket.
他總是口袋裡帶著一把**摺疊刀**。
The diver did a perfect jackknife off the board.
跳水選手從跳板上做了一個完美的**屈體前翻**。
The truck began to jackknife on the icy road.
卡車在結冰的道路上開始**急彎折疊**。
My dad showed me how his old jackknife works.
我爸爸給我演示他那把舊**摺疊刀**的用法。
Did you see the truck jackknife on the highway this morning?
你今天早上有看到卡車在高速公路上**急彎折疊**嗎？
He nailed the jackknife in practice today — the coach was impressed.
他今天練習時完美完成了**屈體前翻**，教練都印象深刻。