To make a fresh start by changing one's behavior or attitude for the better.
This phrase originated in the 16th century when 'leaf' referred to a page in a book, not a plant leaf. The imagery comes from turning to a blank page to start writing anew, symbolizing a fresh beginning. The earliest recorded use was around 1546 in various moral and religious texts.
Many people mistakenly think this phrase refers to autumn leaves or plant foliage, but it's actually about book pages! The confusion is so common that some dictionaries now acknowledge both interpretations, showing how language evolves through popular misunderstanding.
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