pile-up

名词 pile-up:

1. multiple collisions of vehicles
   同义词：pileup

动词 pile-up:

1. collect or gather
   同义词：accumulate, cumulate, conglomerate, pile up, gather, amass
2. arrange into piles or stacks
   同义词：pile up, heap up, stack up
3. get or gather together
   同义词：roll up, collect, accumulate, pile up, amass, compile, hoard

1. The thick fog has caused several bad pile-ups on the motorway.
   因大雾弥漫，高速公路上发生了几起严重的连环撞车事故。