jackknife

剑桥词典

If a truck that has two parts jackknifes, one part moves around so far towards the other part that it cannot be driven .
彎成V字形（如鉸接貨車的彎折）
The oil tanker jackknifed after skidding on the ice . 油罐車在冰上打滑，絞接的車身之間發生了彎折。 返回 jackknife