Pile-up Definition

verb

To form a pile, stack, or heap.

The kids piled up their boots and coats by the back door.
Wiktionary

(idiomatic, intransitive) To collect or accumulate, as a backlog.

The requests piled up while she was away.
Wiktionary
noun

​(idiomatic, colloquial) A traffic accident or collision involving multiple vehicles.

Traffic was backed up for miles due to a twelve-car pile-up on the freeway earlier today.
Wiktionary

Other Word Forms of Pile-up

Noun

Singular:
pile-up
Plural:
pile-ups

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Unscrambles

pile-up