godan verb (-u)
kill each other; fight to the death
Describes a mutual, often violent conflict where participants try to kill one another. Can be used literally or figuratively for intense competition.
戦場で兵士たちが殺し合った。
The soldiers killed each other on the battlefield.
ライバル企業が市場シェアを奪い合
The rival companies are fighting for market share in a competition that is almost like killing each other.