Definition of blockbuster noun from the Oxford Advanced Learner's Dictionary

 

blockbuster

 noun
noun
BrE BrE//ˈblɒkbʌstə(r)//
 
; NAmE NAmE//ˈblɑːkbʌstər//
 
(informal) Types of film
 
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something very successful, especially a very successful book or film/movie a Hollywood blockbuster Wordfinderbiography, blockbuster, book, character, editor, narrator, novel, plot, publish, title See related entries: Types of film Word Origin 1940s (denoting a huge aerial bomb capable of destroying a whole block of streets): from block + buster.
See the Oxford Advanced American Dictionary entry: blockbuster