# pile up

CEFR B2 · Phrasal verb

Source: https://englishreference.com/word/pile-up
Updated: 2026-10-22

## Definition

To increase in amount until there is a lot to deal with. You use this when things like work, mail, or laundry become too much.

For teachers: To accumulate or increase in quantity, often to an unmanageable degree. The verb functions both intransitively to describe the growth of a stack and transitively to describe the act of stacking.

## Examples

- The dirty dishes are starting to pile up in the kitchen.
- If you ignore your emails for a week, they will pile up and become very difficult to manage.
- The evidence against the defendant continued to pile up as more witnesses came forward to testify about the events of that night.

## Usage notes

- Commonly used with nouns representing tasks or burdens, such as 'work', 'emails', or 'debt'.
- Teaching tip: Contrast with 'build up', which can be positive (muscles) or negative (tension), whereas 'pile up' is almost always used for things that feel like a burden.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.