重なる
かさなる · kasanaru · JLPT N3 · verb-godan
lie on top of one another
🥞📚 重 = layer (as in 二重, double) + なる = become: things become layered
重 means heavy, and also a layer or fold, as in 二重 (double) and 重ねる (to stack). Add なる (to become) and things become layered. Sound hook: kasa-naru, where kasa is like a stack of umbrellas (傘) piled on top of each other.
重 — person 人 + east 東 (phonetic)
Originally depicted a person carrying a heavy bundle on their back, suggesting weight and burden. The 東-like element served as a phonetic component. Over time the character split into two readings: zhòng meaning 'heavy' and chóng meaning 'repeat/again'.