pileup

or pile-up

[ 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. 2020

British Dictionary definitions for pileup

pile up

verb (adverb)

to gather or be gathered in a pile; accumulate
informal to crash or cause to crash

noun pile-up

informal a multiple collision of vehicles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with pileup

pile up

1

Accumulate, as in The leaves piled up in the yard, or He piled up a huge fortune. In this idiom pile means “form a heap or mass of something.” [Mid-1800s]

2

Be involved in a crash, as in When the police arrived, at least four cars had piled up. [Late 1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.