1. an aerial bomb containing high explosives and weighing from four to eight tons, used as a large-scale demolition bomb.
  2. a motion picture, novel, etc., especially one lavishly produced, that has or is expected to have wide popular appeal or financial success.
  3. something or someone that is forcefully or overwhelmingly impressive, effective, or influential: The campaign was a blockbuster.
  4. a real-estate speculator who practices blockbusting.

noun informal

  1. a large bomb used to demolish extensive areas or strengthened targets
  2. a very successful, effective, or forceful person, thing, etc
  3. a lavish film, show, novel, etc, that proves to be an outstanding popular success

also block-buster, big bomb (4,000 pounds or larger, according to some sources), 1942, from block (n.) in the “built-up city square” sense. Entertainment sense is attested from 1957. U.S. sense of “real estate broker who sells a house to a black family on an all-white neighborhood,” thus sparking an exodus, is from 1955.

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