noun
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.
その国は長年の内乱で荒廃した。
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.