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pie in the sky noun

  /ˈpaɪ ən ðə ˈskaɪ/ , /ˈpaɪ ɪn ðə ˈskaɪ/
  • (idiomatic) A fanciful notion; an unrealistic or ludicrous concept; the illusory promise of a desired outcome that is unlikely to happen.
 Luftschloss
pie-in-the-sky
illusorisch, irreal
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