缩
suō · HSK 7
to contract
🐢 缩 = silk 纟 + 宿 (sù, to lodge); 宿 lends the sound, threads pull back and shrink
The 宿 sù phonetic sits next to the silk radical 纟; sù also nudges toward suō. A turtle withdrawing its head into its shell is the same motion: pull back, contract, shrink.
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.'