godan verb (-su), intransitive verb
start making a noise; start an uproar; go berserk
Describes the sudden onset of loud, disruptive behavior or commotion. Often used when a group or individual abruptly becomes noisy or agitated.
子供たちが急に騒ぎ出した。
The children suddenly started making a racket.
酔っ払いが店の中で騒ぎ出し
A drunk started causing a commotion in the store and the police were called.