godan verb (-su)
start to sound; begin to ring; begin to make a sound
Used when a sound suddenly starts or emerges, such as a phone ringing, a baby crying, or birds singing.
突然、電話が鳴り出した。
Suddenly, the phone started ringing.
赤ちゃんが泣き出す代わりに、いきなり大きな声
Instead of starting to cry, the baby suddenly began to wail loudly.