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

The massive pileup happened Sunday after a tractor-trailer crashed into multiple vehicles on a highway in the western state of Jalisco, according to the Secretariat of Security and Citizen Protection of Nayarit. — Bonny Chu, FOXNews.com, 13 July 2026

The huge animals knocked bodies to the cobblestones, and stumbling runners caused several pileups during the two-and-a-half-minute run from the pen to the bull ring where bullfighters will kill the bulls later in the day. — ABC News, 11 July 2026

The huge animals knocked down bodies to the cobblestones, and stumbling runners caused several pileups during the 2½-minute run from the pen to the bullring where bullfighters would kill the bulls later in the day. — Los Angeles Times, 11 July 2026

If this is food-history whiplash, bring on the 17-car pileup. — Scott Hocker, TheWeek, 9 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