To tell or persuade someone repeatedly; to admonish, warn, or reason with someone so they accept or follow advice.
母は毎晩、子供に早寝するよう言い聞かせた。
Every night the mother told her child to go to bed early.
先生は学生たちに試験勉強の必要性を言い聞かした。
The teacher admonished the students about the need to study for exams.
彼は失敗してもくじけるなと自分に言い聞かせた。
He told himself not to give up even after failing.