From Longman Dictionary of Contemporary Englishturn over a new leafturn over a new leafBEHAVEto change the way you behave and become a better person I see fatherhood as a chance to turn over a new leaf. → leaf
Examples from the Corpus
turn over a new leaf• Monnett agrees too, so much that he has turned over a new leaf.• There is no indication that Hollywood is turning over a new leaf, free of bloodstains.• I know I've done some bad things in the past, but now I'm turning over a new leaf.• Like all fathers, I see fatherhood as a chance to turn over a new leaf.• After being released from jail, Tony decided to turn over a new leaf.• Faldo, perhaps above all, will be hoping to turn over a new leaf.• We urge them to turn over a new leaf. 