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src: wikipedia
- Definition
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- pile up :collect or gather
- Journals are accumulating in my office|The work keeps piling up
- pile up :arrange into piles or stacks
- She piled up her books in my living room
- pile up :get or gather together
- I am accumulating evidence for the man's unfaithfulness to his wife|She is amassing a lot of data for her thesis|She rolled up a small fortune