Turn over a new leaf

Turn over a new leaf

Meaning:

Start to do someting again in a better way, forgetting past errors.

If you turn over a new leaf, you will start to behave better or become a better person.

Example:

Stephen said he has turned over a new leaf, and that he's going to quit smoking and drinking and start to exercise every day.

She decided to turn over a new leaf after her mother's death.