To reason with someone, admonish, or persuade them—explaining a fault or mistake so that they understand; to warn or exhort gently but firmly.
先生は生徒の行動を諭して落ち着かせた。
The teacher admonished the student and calmed them down.
親は子どもにやさしく諭したが、子どもは聞こうとしなかった。
The parent gently tried to reason with the child, but the child wouldn't listen.
彼は友人の無謀な計画を諭して思いとどまらせた。
He persuaded his friend to reconsider by reasoning with him about the reckless plan.