To become a bestseller means that something has achieved great success and become very popular, often by selling a large number of copies or being highly praised by critics.
Sentences with «to become a bestseller»
Sometimes... but, more typically, a book becomes a bestseller by accident. (bookpr.com)
It sold in over 40 countries and became a bestseller in many of them. (enterthepassage.com)
He has written 4 books including this one which became a bestseller and has sold millions of copies. (elearningindustry.com)