massive brawl; large-scale fight; melee
Refers to a chaotic, large-scale physical fight involving many people, often in public or in a competitive setting.
A massive brawl broke out during the match.
Last night's party ended in a huge fight.
Compound of 大 (large) and 乱闘 (brawl, melee). The exact historical derivation is uncertain, but the word is transparently formed from its components.