—v. phr., to make a new start in your life, to change your behavior or your plans. This is an appropriate idiom for autumn, when trees are losing their leaves. But the idiom actually comes from the idea of turning pages in a book. .
Example:
Brian wanted to turn over a new leaf after his troubles in university.
Related English
The word leaf (n.) also means a part of a book, or a page that your turn. And if you leaf through (phrasal verb) a book, you turn its pages and look at what is on them.
Example:
She leafed through the magazine while she waited to see the doctor.
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