1.
civil war, internal strife, rebellion, uprising
Armed conflict or violent unrest within a country, as opposed to war between nations.
Related Words
Homophone:
内覧
Synonym:
内戦 (more common in modern news)
Related:
反乱 (rebellion, revolt)
Related:
紛争 (conflict, dispute)
Compare:
騒乱 (disturbance)