TSUMUGU · TOCFL 2 (est.) · 字
虛
虛 ＝ 虍 ＋ 丘
ㄒㄩ · xū
adj — empty, void; false; weak
字源 FORM — what the parts do
虍聲hū — gives the soundthe tiger's striped head, here only for the reading
Fhū → xū — the final shifts
A great mound (丘), worn flat into the foot of the graph, standing wide and bare — the original sense was a vast empty hill. The tiger-stripe cap 虍 hū lends the sound, drifting to xū. From the empty hill: 虛空, 空虛, then false (虛假), modest (謙虛), and weak (虛弱).
故事 STORY — a scene to remember it by
一座大丘（丘）站在那裡，空空的——什麼也沒有，這就是虛。
A great mound (丘) standing there, wide and bare — nothing on it; that is 虛, empty.
字源記憶法
意 · Meanings
(本義)大丘、空虛— a vast empty hill; emptiness
→虛空、空虛— empty, void常用
⇒虛假、謙虛— false; humble常用
⇒虛弱— weak, frail
(本義) original meaning · → ⇒ each arrow = one more step of extension