TSUMUGU · TOCFL 2 (est.) · 字
某
某 ＝ 木 ＋ 甘
ㄇㄡˇ · mǒu
pronoun — a certain (person, thing); so-and-so
字源 FORM — what the parts do
甘義sweet — a mouth (口) holding something
A tree (木) over 甘, the mouth tasting sweet-sour — the old word for a plum or sour fruit. That fruit-word was borrowed away to mean a certain unnamed one: 某人, 某天. The fruit sense left; the placeholder stayed. As a sound 某 still seeds 謀 móu, 媒 méi.
故事 STORY — a scene to remember it by
樹（木）上結的酸果，含在嘴裡（甘）——後來誰也不指名，就叫某。
A sour fruit off the tree (木), held in the mouth (甘) — later no name is named, and it is just a certain one.
字源記憶法
意 · Meanings
(本義)酸果— a sour fruit (a plum)
→某人、某事— a certain one; so-and-so常用
⇒某種、某些— some, a certain kind
(本義) original meaning · → ⇒ each arrow = one more step of extension