pile up
US /paɪl ʌp/
UK /paɪl ʌp/

1.
acumularse, amontonarse
to accumulate or increase in quantity, especially to an unmanageable degree
:
•
The dirty dishes started to pile up in the sink.
Los platos sucios empezaron a acumularse en el fregadero.
•
Work tends to pile up when you're on vacation.
El trabajo tiende a acumularse cuando estás de vacaciones.
2.
chocar, amontonarse
to crash or collide, especially involving several vehicles
:
•
Several cars piled up on the icy road.
Varios coches se amontonaron en la carretera helada.
•
The accident caused traffic to pile up for miles.
El accidente provocó que el tráfico se acumulara por millas.