勃 means “sudden rise, break out”

ぼつ · botsu

Also: suddenness, rise

Kun'yomi (Japanese reading)
おこる, にわかに
On'yomi (Chinese reading)
ボツ, ホツ

JLPT N1 · Taught in secondary school · 9 strokes

The story

Strength (力) beside 孛, a sprouting top over a child (子): power bursting up out of nowhere. 勃 lives in news of things erupting: 戦争が勃発する is war breaking out, and 勃興 is a sudden rise to power.

Used in 勃発 (boppatsu, outbreak) and 勃興 (bokkou, sudden rise)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.