TSUMUGU · C1 (est.) · 字
驟
ㄓㄡˋ · zhòu
adj/adv — sudden, abrupt; suddenly
字源 FORM — what the parts do
IFTjù → zhòu — initial, final and tone all shift
A horse (馬) at a hard gallop — 馬疾步也, the quick driving step. 聚 jù carries the sound, worn far to zhòu. A galloping horse is on you all at once; from that came the sense of the abrupt: 驟然, 驟變, 驟增.
故事 STORY — a scene to remember it by
馬（馬）一陣疾奔，眨眼就到——驟。
The horse (馬) breaks into a hard gallop, on you in a blink — all at once.
字源記憶法
意 · Meanings
(本義)馳驟— a horse galloping fast
→驟然、驟變— sudden, abrupt常用
⇒驟增— to rise sharply, all at once
(本義) original meaning · → ⇒ each arrow = one more step of extension