TSUMUGU · TOCFL 6 (est.) · 字
庸
庸 ＝ 用 ＋ 庚
ㄩㄥ · yōng
adj — ordinary, commonplace, mediocre; verb — to use, to need (毋庸)
字源 FORM — what the parts do
庚形庚 — a frame (the seventh stem); here the surrounding structure
說文 reads it 用也, to use — 用 (use) set within the frame of 庚. What is in constant, everyday use is the ordinary and the unremarkable: 平庸, 庸俗, the common run of things. The same 'in use' sense survives in 毋庸 (no need) and the steady mean of 中庸.
故事 STORY — a scene to remember it by
天天都在用（用）的東西，誰都不多看一眼——庸。
What is in use (用) every single day draws no second glance — the ordinary, 庸.
字源記憶法
意 · Meanings
(本義)用、毋庸— to use; to need
→平庸、庸俗— ordinary, commonplace, mediocre常用
→中庸— the constant mean — the steady, unswerving way
(本義) original meaning · → ⇒ each arrow = one more step of extension
關 · Related
傭yōngthe 庸 series — 亻 added; a hired hand席xíthe lookalike — a 广 over 巾, a woven mat, not