Definition
To pile up is to accumulate into a heap — and, more often than not, an unwelcome one. It is the informal, faintly dreading cousin of accumulate: dishes, laundry, debts, unanswered emails and traffic all pile up, usually faster than we deal with them. The phrasal verb carries a sense of disorder and excess — of things mounting past the point of comfort — which is why the noun 'pile-up' can mean a motorway crash as readily as a backlog of work.
Examples
Collocations
debts pile up·work piles up·dishes pile up·a pile-up on the motorway·pile up quickly
Synonyms
accumulate·build up·amass·mount·stack up
Antonyms
See also
- pile up vs accumulatesynonyms
- pile up vs amasssynonyms
- pile up vs build upsynonyms
- pile up vs gathersynonyms
Word family
pile-up (noun)·piled-up (adjective)
In TOEFL & IELTS
An informal, high-frequency phrasal verb that shines in speaking — 'work/emails/dishes pile up' — and carries a clear note of unwanted excess. The noun 'pile-up' means a multi-vehicle crash. Keep the nuance against accumulate (neutral, often passive) and collect (deliberate, orderly): pile up is the disorderly, dreaded version, things heaping past the point of comfort.