声こえを大だいにする

expression, suru verb (irregular)

raise one's voice; emphasize; speak loudly about

Used when someone speaks more loudly or emphatically to stress a point, often in the context of asserting an opinion or making a declaration.

• 彼かれは反はん対たい意い見けんを声こえを大だいにして主しゅ張ちょうした。

  He raised his voice to assert his opposing opinion.

• 安あん全ぜんの重じゅう要よう性せいを声こえを大だいにして訴うったえたい。

  I want to speak out loudly about the importance of safety.