积淀
jī diàn · HSK 7
fig. valuable experience
🏺🪨 积淀 = 积 accumulate + 淀 sediment: layers that settle and pile up over time
积 means to amass or accumulate; 淀 is sediment that settles at the bottom of water. Together they name the silt that builds up over years, and by extension the experience and wisdom a person collects across a lifetime.
积 — grain radical 禾 + 责 (phonetic)
积 is a semantic-phonetic compound: 禾 (grain) gives the meaning, while 责 supplies the sound. It originally referred to piling up harvested grain, which extended to the general sense of 'accumulate' or 'amass'. The simplified form replaced the older 積.