TSUMUGU · TOCFL 2 (est.) · 字
倍
倍 ＝ 亻 ＋ 咅
ㄅㄟˋ · bèi
noun/measure — times, -fold; verb — to double
字源 FORM — what the parts do
亻義a person
咅聲pǒu — gives the soundthe split-open seed graph, worn down to an abstract top
{b,p,f}ITpǒu → bèi — the {b,p,f} crossing, tone shifts too
A person (亻) set against an amount, and the amount comes back doubled — 反 in the old gloss, the turning-back into twice as much. 咅 pǒu carries the sound, worn b-ward. From there, every multiple: 兩倍 twice, 三倍 thrice. It runs in a sound series with 陪、培、剖、部.
意 · Meanings
(本義)加倍— to double常用
→兩倍、三倍— times; -fold常用
→倍增— to multiply — growth doubled
(本義) original meaning · → ⇒ each arrow = one more step of extension