ph.
1. （使）堆放；（使）堆积；（使）成堆
If you pile up a quantity of things or if they pile up, they gradually form a pile.
2. （使）（工作、问题、损失等）积聚
If you pile up work, problems, or losses or if they pile up, you get more and more of them.
1. collect or gather
e.g. Journals are accumulating in my office
The work keeps piling up
Synonym: accumulatecumulateconglomerategatheramass
2. arrange into piles or stacks
e.g. She piled up her books in my living room
Synonym: heap upstack up
3. get or gather together
e.g. 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