The phrase "To turn Over A new Leaf" means to start a new life again. If some one turns Over A new Leaf he starts a new life after recovering from a shock or after an accident or similar cases.
1. John turned over a new leaf after an abject failure in the exams.
2. Reva turned over a new leaf after she got married to Farhan.
3. to Turn over a new leaf was not at all easy for the children after the accidental death of their mother.