turn over a new leaf

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turn over a new leaf (third-person singular simple present turns over a new leaf, present participle turning over a new leaf, simple past and past participle turned over a new leaf)

  1. (idiomatic) To engage in self-improvement; to begin a good habit or shed a bad habit.
    Every year he resolves to turn over a new leaf and start exercising.
  • (determination to do what is wrong or destructive): break bad