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- DictionaryBlue-sky/ˈblo͞oˌskī/
adjective
- 1. not yet practical or profitable: informal "blue-sky research"
verb
- 1. make impractical or as yet unachievable plans.
adjective
verb
Sky blue refers to a collection of shades comparable to that of a clear daytime sky. Typically it is a shade of cyan or light teal, though some iterations are closer to light blue. The term (as "sky blew") is attested from 1681. A 1585 translation of Nicolas de Nicolay's 1576 includes "the tulbant [turban Wikipedia