説とき出いだす

godan verb (-su), intransitive verb

begin to speak; begin to explain

Used when someone starts talking or explaining something, often after a pause or hesitation. The verb focuses on the act of beginning to verbalize thoughts.

• 彼かれはしばらく黙だまっていたが、やがて事じ情じょうを説とき出いだした。

  He was silent for a while, but eventually began to explain the circumstances.

• 先せん生せいが教きょう科か書しょの内ない容ようを説とき出いだすと、教きょう室しつは静しずかになった。

  When the teacher began to explain the textbook content, the classroom fell silent.