勃発

outbreak

b o̞ p̚ p a̠ t͡s ɨ
noun Rare #32,708
outbreak Usually refers to the sudden start of a war, conflict, or violence.
JA: 戦争の勃発は多くの人を驚かせた。
EN: The outbreak of the war surprised many people.

戦争が勃発したとき、あなたはいくつでしたか。

How old were you when the war broke out?

その戦争は偶然に勃発したわけではない。

That war did not break out by accident.

虐殺の後内戦勃発の直後です

This is just after the massacre, immediately following the outbreak of the civil war.

— 灼熱の魂 (2010)

一連の出来事が戦争の勃発を引き起こした。

A series of events led to the outbreak of war.

<暴動で暴力が勃発>

Violence erupts during the riot

— 新感染 ファイナル・エクスプレス (2016)