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to begin making a sound (ringing, singing, crying, etc.)
目覚ましが六時に鳴り出した。
The alarm clock started ringing at six.
急に電話が鳴り出して、慌てて出た。
The phone suddenly started ringing, and I scrambled to answer it.
次の授業の開始を知らせるベルが鳴り出す。
The bell rings to signal the start of the next class.