累积 lěijī to accumulate
How to remember 累积: 累 tired + 积 store up = to accumulate.
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How it is used
- To pile up / accumulate over time - 累积经验 (lěijī jīngyàn) to build up experience; 长期累积的问题 problems that have piled up over time.
- Note the reading lěi (not lèi 'tired'). Emphasizes gradual stacking/growth of a quantity.
- Near-synonym 积累 (jīlěi) is more common in speech; meaning is essentially the same.