turn over a new leaf 洗心革面

“洗心革面”，汉语成语，意思是去除旧思想，改变旧面貌，比喻彻底悔改。与英文俚语“turn over a new leaf”意思相近，表示“to reform and begin again；to change one's behavior, usually in a positive way”。

例句：

洗心革面，迷途知返

repent one's errors and turn over a new leaf

他将洗心革面，努力工作。

He is going to turn over a new leaf and work hard.