to turn over a new leaf
01
心を入れ替える, 生まれ変わる
to make changes to one's behavior or mindset in order to become a better and more responsible person
例
Apparently he's turned over a new leaf and he's not smoking any more.
何年ものトラブルのあと、彼は心を入れ替えてより良い父親になることにした。
