delusion of grandeur

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delusion of grandeur ‎(plural delusions of grandeur)

  1. (chiefly in the plural) The false belief that one is important or powerful, accompanying certain mental disorders.
  2. (chiefly in the plural) Conceitedness or overconfidence.
    • 2004, Tom Shone, Blockbuster: How Hollywood Learned to Stop Worrying and Love the Summer, page 285:
      [A]s Han Solo, always the voice of reason in the series, says, “I'm out of it for a little while, and everyone gets delusions of grandeur.”