To turn the page means to leave a difficult situation behind and move on to a new period in your life. It’s more commonly used in American English.
Joan cried a lot during her divorce. When it was over, she decided to turn the page and start partying again.
The president told the nation the war was over and asked them to turn the page and work for the reconstruction of the country.
Don't confuse this expression with to be on the same page. That phrase means 'to think in a similar way'.
The team leader organised a meeting as soon as he started in the new post. He wanted to make sure everybody was on the same page.
According to the website guinnessworldrecords.com, the largest book ever printed measures 5m x 8.06m, weighs about 1500kg and has 429 pages. It was unveiled by Mshahed International Group in Dubai, UAE, on 27 February 2012.