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[bloo-skahy] /ˈbluˈskaɪ/
fanciful; impractical:
blue-sky ideas.
(especially of securities) having dubious value; not financially sound:
a blue-sky stock.
Origin of blue-sky
First recorded in 1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for blue sky
Contemporary Examples
Historical Examples
  • Above him all the birds were warbling their morning song up into the blue sky.

  • Kenyon reclined in his deck-chair with his eyes fixed on the blue sky.

    A Woman Intervenes Robert Barr
  • I looked up to the blue sky, wept, and for the first time fell on my knees. '

    Wilfrid Cumbermede George MacDonald
  • On the horizon the sand hills of Wellmouth notched the blue sky.

    Cy Whittaker's Place Joseph C. Lincoln
  • A strip of blue sky appears—and hearts grow lighter at the sight.

    The Great Hunger Johan Bojer
British Dictionary definitions for blue sky


(modifier) of or denoting theoretical research without regard to any future application of its result: a blue-sky project
verb -skies, -skying, -skied
to theorize (about something that may not lead to any practical application)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Slang definitions & phrases for blue sky

blue sky

noun phrase

  1. Speculation; guesswork: That may sound great, but it's just blue sky (1980s+)
  2. Heroin: ex-psychiatric case from Bellevue with a minor in blue sky and toot (1980s+ Narcotics)

verb phrase

To hold a brainstorming session with no limit on the strangeness of the ideas proposed (1980s+)



Having no sound factual or value basis; recklessly imaginative: a budget figure, as it turned out, and a blue-sky one at that

[1900+ Finance; perhaps fr the purveyor's fanciful description being as appealing and unclouded as the wide blue sky]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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