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pipe dream noun

  /ˈpaɪp driːm/ , /ˈpaɪp ˌdrim/
  • (idiomatic, originally, US) A desire or idea which is unlikely to materialize, or a plan which is unlikely to work; a near impossibility. [from late 19th c.]
 возду́шные за́мки, несбы́точная мечта́
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