civil war; insurrection; rebellion; domestic conflict
Refers to armed conflict or large-scale upheaval within a country, as opposed to external war. Often used in historical, political, or news contexts.
The country was devastated by years of civil war.
内乱の拡大を防ぐために国際社会が介入した。
The international community intervened to prevent the spread of the insurrection.
A civil war broke out in that country.
The government forces suppressed the rebellion.
The whole country fell into a state of civil war.