TSUMUGU · TOCFL C1 (est.) · 字
軸
ㄓㄡˊ · zhóu
noun — an axle; a central shaft, an axis
字源 FORM — what the parts do
{zh,ch}ITyóu → zhóu — the initial hardened to zh, the tone shifted
The bar of the cart (車) that holds the wheels and lets them turn — the axle, then any central shaft, then the axis a thing spins on: 車軸、中軸線. 由 yóu carries the sound, hardened to zhóu.
故事 STORY — a scene to remember it by
車（車）輪中心穿著一根桿——輪子繞著它，轉個不停。
Through the cart's (車) wheel runs one bar — the wheel turns round it, on and on.
字源記憶法
意 · Meanings
(本義)車軸— the axle of a cart
→軸心、轉軸— a central shaft, a pivot常用
⇒中軸、軸線— an axis常用
(本義) original meaning · → ⇒ each arrow = one more step of extension