TSUMUGU · TOCFL B2 (est.) · 字
袖
ㄒㄧㄡˋ · xiù
noun — sleeve
字源 FORM — what the parts do
IFyóu → xiù — initial and final both reshape
The clothing radical (衤) with 由 yóu on the right for the sound, worn to xiù. 由 reads like a passage something comes out through — and the arm runs out through the sleeve: 袖子、衣袖.
故事 STORY — a scene to remember it by
手臂從衣（衤）的筒口（由）裡穿出來——這一截就是袖。
The arm runs out through the opening (由) of the garment (衤) — that length of cloth is the sleeve.
字源記憶法
意 · Meanings
(本義)衣袖— sleeve常用
→袖子、袖口— sleeve; cuff常用
⇒袖手旁觀— to look on with hands in sleeves — to stand aside
(本義) original meaning · → ⇒ each arrow = one more step of extension