TSUMUGU · TOCFL 2 (est.) · 字
必
ㄅㄧˋ · bì
adv — surely, must
字源 FORM — what the parts do
必形a weapon's shaft with its grip marked — the old graph of 柲
A pole-arm's shaft, a marker wound at the grip — the old graph of 柲 bì, the halberd's haft. The word must borrowed the character whole; the haft took on 木 and lives as 柲. What remains of 必 only says certainty: 必須、必要、不必.
故事 STORY — a scene to remember it by
長戟立在架上，柄（必）上那圈纏記還在——手一伸，握的就是那裡。
The halberd stands in its rack, the binding still wound at the grip (必) — a hand reaches, and lands exactly there.
字源記憶法
意 · Meanings
(本義)柄（柲的本字）— the haft — the old form of 柲
(假借)一定、必須— must, surely常用
(本義) original meaning · → ⇒ each arrow = one more step of extension