pileup

noun

pile·​up ˈpī(-ə)l-ˌəp 

1

: a collision involving usually several motor vehicles

2

a

: a jammed tangled mass or pile (as of motor vehicles or people) resulting from collision or accumulation

b

: accumulation

Synonyms of pileup

• accumulation
• collection
• pile
• jumble
• mixture
• gathering
• assemblage
• cumulation

Examples of pileup in a Sentence

A five-car pileup slowed traffic.

a pileup of e-mail messages that needed to be dealt with

Recent Examples on the Web

But the drought is still hitting home with record-low water levels on the Danube River disrupting grain transport, causing chronically congested terminals and an increasing pileup of crops with nowhere to go. — ABC News, 13 Aug. 2026

The moves come as 311 has received nearly 3,000 complaints related to dog waste citywide so far this year, including a significant spike after the lengthy, lingering snow pileups this winter. — Jesse Zanger, CBS News, 13 Aug. 2026

The prank consisted of 50 individuals simultaneously ordering a Waymo on the same dead-end street, creating a pileup that made the company disable rides until the next morning. — Joshua Hong, Fortune, 13 Aug. 2026

The California rapper-producer’s new album sifts through an eclectic pileup of influences with X-ray vision, exposing his artistic process and still keeping it breezy. — Hattie Lindert, Pitchfork, 29 July 2026

Word History

First Known Use

1900, in the meaning defined at sense 1

Rhymes for pileup

• backup
• blowup
• breakup
• buildup
• checkup
• cleanup
• holdup
• hookup
• lineup
• lockup
• makeup
• markup