entries → 勃
TSUMUGU · TOCFL C1 (est.) · 字
勃 character · TOCFL C1 (est.)
勃 ＝ 力 ＋ 孛
ㄅㄛˊ · bó
adj/verb — sudden, vigorous, surging up

字源 FORM — what the parts do

力義strength
孛聲bó — gives the sounda comet, something bursting into bloom
Strength (力) bursting up all at once — to surge, to rise vigorous and sudden. 孛 bó carries the sound exactly, and its own "bursting bloom" suits the surge: 勃發、蓬勃、勃然.

故事 STORY — a scene to remember it by

一股力（力）猛地冒上來（孛），擋都擋不住。
A surge of strength (力) bursts up all at once (孛), past all holding back.
字源記憶法
意 · Meanings
(本義)勃發、蓬勃— to surge up, flourish常用
→勃然、勃興— sudden, abrupt (of anger, rising)
(本義) original meaning · → ⇒ each arrow = one more step of extension
關 · Related
孛bóthe sound donor — 勃 adds 力 for the surging force脖＝ 月 ＋ 孛bóthe 孛 series, with 月(肉) — the neck