堆积 duījī to pile up
to pile up; to heap; accumulation
How to remember 堆积: 堆 crowd + 积 store up = to pile up.
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How it is used
- To pile up / accumulate - 垃圾堆积如山 (lājī duījī rú shān) trash piled mountain-high; 堆积如山的文件 (duījī rú shān de wénjiàn) stacks of documents.
- About physical or figurative accumulation building up in quantity. Neutral/written.