1. turn over a new leaf - Verb
2. turn over a new leaf - Phrase
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)
(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.
I turn over a new leaf every day," I said. "But the blots show through. Keith Waterhouse
I'll turn over a new leaf. Miguel de Cervantes
But going beyond the personal, perhaps, it’s also a decade to turn over a new leaf with collective pledges for the benefit of the very planet we inhabit. Source: Internet
Since leaving Bayview, Claire has seemed to turn over a new leaf. Source: Internet
It is time to turn over a new leaf. Source: Internet