TSUMUGU · A2 (est.) · 字
背
ㄅㄟˋ · bèi
noun — the back; verb — to turn one's back on, to carry on the back
字源 FORM — what the parts do
Tběi → bèi — the tone shifted off the donor
北 is two people standing back to back — already the picture of a back. Flesh (月) makes it a body part: 背. It carries its own sound, worn one tone from běi. The same 北 builds 倍、悖.
故事 STORY — a scene to remember it by
兩個人背對背（北）站著，再貼上一塊肉（月）——這就是背。
Two people standing back to back (北); add the flesh (月) — the back.
字源記憶法
意 · Meanings
(本義)背、脊背— the back (of the body)常用
→背後、背面— behind; the reverse side
⇒背叛、違背— to turn one's back on — to betray
(本義) original meaning · → ⇒ each arrow = one more step of extension