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English definition of “blue-sky”

blue-sky

adjective [before noun] uk   /ˌbluːˈskaɪ/ us  
using the imagination to think of ideas that do not yet have practical uses or make money: blue-sky research blue-sky thinkingInspiration and inspiringImagining and conceiving
(Definition of blue-sky from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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