- a massive collision of several or many moving vehicles.
- an accumulation, as of work, chores, or bills.
- a rough or disorderly falling of people upon one another, as in a football game.
Origin of pileup
First recorded in 1825–35; noun use of verb phrase pile up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018