battle royal

Translations
ожесточённая борьба
The debate turned into a battle royal with both sides refusing to back down.
Дебаты превратились в ожесточённую борьбу, в которой обе стороны отказались уступать.
Definitions
A battle royal is a fight involving many participants, typically where each person fights against all others until only one remains. The term is often used in wrestling, video games, and literature to describe a chaotic, last-person-standing competition.