To advise someone earnestly and patiently, even if it's unpleasant or unwelcome.
苦口反复规劝；婆心仁慈的心肠。比喻善意而又耐心地劝导。
《宋史·赵普传》忠言苦口，三复来奏。”宋·释道原《景德传灯录·泉州道匡禅师》问‘学人根思迟回，乞师曲运慈悲，开一线道。’师曰‘这个是老婆心。’”
She was ku-ko-po-xin with her son about his grades, but he ignored her advice.
Learn the next connected idiom: 苦口婆心 (kǔ kǒu pó xīn) → 心有余悸 (xīn yǒu yú jì)
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