godan verb (-ru), transitive verb
slash wildly; cut down many; attack relentlessly
Literally means to cut or slash vigorously and continuously, often against multiple opponents or in a frenzied manner. Figuratively, it can mean to criticize or argue vehemently, as if cutting down arguments.
侍が敵を次々と切りまくった。
The samurai slashed through the enemies one after another.
討論会で彼は相手の
At the debate, he vehemently attacked his opponent's opinions.