intransitive verb
Etymology: pile (VI)
1. : to get into a tangle or confused mass
angry horn blasts from cars that had piled up in the intersection
2. : to run aground : become stranded
that difficult coast where the wrecks still piled up — Marjory S. Douglas
piled up on a reef just off a lovely island — Time
3.
a. : to become involved in a pileup of vehicles ; broadly : to wreck one's car : crack up
b. : to crash an airplane