A brawl or melee: a chaotic fight involving multiple people, often accompanied by confusion or scuffling.
試合後に観客同士で乱闘が起きた。
A brawl broke out among spectators after the game.
警察が現場に到着して乱闘を鎮圧した。
The police arrived on the scene and quelled the brawl.
居酒屋での口論が乱闘に発展した。
An argument at the izakaya escalated into a brawl.
乱闘の末、数人がけがをした。
After the brawl, several people were injured.