What does "pile-up" mean?

A pile, a group of people or things which have piled up on one another, especially; A pile of crashed vehicles due to a traffic accident.

What is a synonym for "pile-up"?

Common synonyms include: dogpile.

noun, slang

noun, slang ·Moderate ·College level

Noun

1
A pile, a group of people or things which have piled up on one another, especially; A pile of crashed vehicles due to a traffic accident. colloquial
"Traffic was backed up for miles due to a twelve-car pile-up on the freeway earlier today."
2
A pile, a group of people or things which have piled up on one another, especially; A pile of tackling players. colloquial
3
An accumulation that occurs over time, especially one which is not welcome.
"If the supervisor deals with daily workload in an orderly way and does not put pressure on the employee about a pile-up of work, then the employee's perception of pressure will be reduced and the employee will not suffer from work pressure stress."

"There was a pile-up on the town bypass involving about twenty cars."

Deverbal from pile up.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.