pileup

名词 pileup:

1. multiple collisions of vehicles

pileup 或 pile-up

n.（名词）
Informal A serious collision usually involving several motor vehicles.
【非正式用语】 多车相撞：通常牵扯到几辆机动车的严重撞车事件
An accumulation:
堆积，积聚：
例句：
.the pile-up of unsold autos.(New York Times)
.未售车辆的堆积.(纽约时报)