TSUMUGU · TOCFL 1 · 字
張
ㄓㄤ · zhāng
measure — for flat things; verb — to open, stretch; a surname
字源 FORM — what the parts do
Tzhǎng → zhāng — the tone flattens
A bow (弓) strung and drawn — stretched open. 長 gives the sound, the zhǎng of 長大, tone flattened. From the drawn bow: to open wide (張開、張嘴), then the measure for things stretched flat — 一張紙、一張桌子 — and the surname.
故事 STORY — a scene to remember it by
他把弓（弓）慢慢拉開，弦繃得緊緊的。
The bow (弓) drawn slowly open, the string stretched tight.
字源記憶法
意 · Meanings
(本義)張弓— to string and draw the bow
→張開、張嘴— to open wide
→一張— the measure for stretched-flat things常用
→姓張— the surname
(本義) original meaning · → ⇒ each arrow = one more step of extension