The phrase "big bestsellers" refers to books that have achieved a very high level of popularity and sales.
Sentences with «big bestsellers»
Do you really think that no one starting out today will become the next big bestseller by going traditional? (deanwesleysmith.com)
Frequently authors do this with a number of their titles all at once and garner tremendous revenue until another author pays a higher fee to surpass them or a really big bestseller comes out. (goodereader.com)
Big bestseller in its day — backlist (hard to tell if in print or not) today. (goodereader.com)