pileup

[ pahyl-uhp ]
/ ˈpaɪlˌʌp /

noun

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. 2019