To explain or expound an idea or teaching; to preach or advocate a principle or viewpoint.
牧師は教会で平和の大切さを説いた。
The pastor preached the importance of peace at the church.
彼女は自分の理論を分かりやすく説くのが上手だ。
She is good at explaining her theory in an easy-to-understand way.
研究者は新しい仮説の根拠を論文で説いた。
The researcher argued the basis for the new hypothesis in the paper.
To persuade or prevail upon someone by reasoning; to urge someone to do something.
医師が患者に禁煙の必要性を説いた。
The doctor persuaded the patient of the need to quit smoking.
彼は何度も説いて、ついに参加を承諾させた。
He persuaded him after many attempts and finally got him to agree to join.
親は子どもに対して礼儀の大切さを説くことが多い。
Parents often urge their children on the importance of manners.