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English definition of “blue-sky”

blue-sky

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