Definitions:

1. a film with a large budget that is expected to draw a good return noun
   • The studio has a summer full of blockbusters lined up.
2. a large bomb used to demolish extensive areas, as a city block noun
   • The Royal Air Force dropped blockbusters on Berlin during World War II.
3. an unusually successful hit with widespread popularity and huge sales, especially a movie, play, recording, or novel noun
   • My last three movies were all blockbusters.

Synonyms:

• megahit
• smash hit