pile up

US /paɪl ʌp/
UK /paɪl ʌp/
"pile up" picture
1.

堆积, 积压

to accumulate or increase in quantity, especially to an unmanageable degree

:
The dirty dishes started to pile up in the sink.
脏盘子开始在水槽里堆积起来
Work tends to pile up when you're on vacation.
度假时工作往往会堆积如山
2.

撞车, 堆积

to crash or collide, especially involving several vehicles

:
Several cars piled up on the icy road.
几辆车在结冰的路上撞成一团
The accident caused traffic to pile up for miles.
事故导致交通堵塞数英里。