收缩
shoū suō · HSK 7
to shrink
🪗 收缩 = 收 collect/withdraw + 缩 shrink; pull things in and they contract
收 — 丩 (jiū, cord/bind) + 攵 (rap/strike, action)
Originally written 收, this character combines 丩 'twisted cord' as the phonetic with 攵 'a hand holding a stick' as the semantic, depicting the action of binding up captives or gathering things together by force. The core sense 'to gather, collect, harvest' grew naturally from this image of rounding up and tying.
缩 — silk radical 糹 + 宿 (lodge, phonetic)
A semantic-phonetic compound. The silk radical 糹 carries the meaning, since shrinking and tightening were associated with drawing in cords or fabric. The right side 宿 (sù) supplies the sound. The original sense of binding cloth tight extended to the modern meaning 'to shrink' or 'contract.'