TSUMUGU · A2 (est.) · 字
咳
咳 ＝ 口 ＋ 亥
ㄎㄜˊ · ké
verb — to cough
字源 FORM — what the parts do
亥聲hài — gives the soundthe twelfth earthly-branch graph
{h,k}IThài → ké — the {h,k} crossing at the throat, tone shifts
A mouth (口) and a sound forced out of it. The old graph wrote an infant's laugh, 小兒笑也; the same mouth-noise narrowed to the bark of a cough. 亥 hài lends the sound, shifted to ké. It runs in the 亥 series with 該、孩、刻.
故事 STORY — a scene to remember it by
喉嚨一緊，口（口）裡逼出那一聲——咳。
The throat tightens, and the mouth (口) forces out that one bark — a cough.
字源記憶法
意 · Meanings
(本義)咳嗽— to cough常用
→乾咳— a dry cough
→咳聲— the sound of coughing
(本義) original meaning · → ⇒ each arrow = one more step of extension