turn over a new leaf

You use this phrase when talking about a major lifestyle shift. You can use it in the past tense like I turned over a new leaf. You can also use it as a goal: I am trying to turn over a new leaf. It usually follows a period of doing something wrong or being lazy. It is a very positive expression. It shows you are taking responsibility for your future.

This is perfect for New Year's resolutions. Use it when you start a new diet or exercise routine. It works well after you apologize to someone. For example, if you were always late to meetings, tell your boss you are turning over a new leaf. Use it when you quit a bad habit like smoking or procrastinating. It sounds sincere and determined.

Do not use this for small, temporary changes. If you just bought a new shirt, you are not turning over a new leaf. Avoid using it for things that are out of your control. It must be a personal choice. Also, do not use it if you are not actually changing. If you say it but keep doing the same thing, people will think you are joking. It is a heavy phrase, so use it for meaningful shifts.

This phrase actually comes from old books! In the 16th century, the pages of a book were called leaves. When you finished one page, you turned it over to start a blank one. It was originally about starting a new chapter in a literal book. Over time, it became a metaphor for life. It is deeply rooted in the Western idea of the 'fresh start' and 'self-made' progress.

You might hear people say start with a clean slate. This is very similar. Some people just say they are starting fresh. However, turning over a new leaf is the most poetic version. It implies that the old 'leaves' are still there, but you are choosing to focus on the new one. It is a very common idiom in both British and American English.