munchausen

/ˈmʌntʃaʊzən/
noun
  1. A person who tells exaggerated or false stories about their own adventures or experiences.
    • He's such a munchausen, always claiming he climbed Everest last weekend.
    • Don't believe everything she says; she's a bit of a munchausen.
    • The old sailor was a munchausen, spinning wild tales of sea monsters.
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