what does the term blue sky mean?
1. a light shade of blue. Familiarity information: SKY-BLUE used as a noun is very rare. â¢ SKY-BLUE (adjective). The adjective SKY-BLUE has 1 sense: 1. of a deep somewhat purplish blue color similar to that of a clear October sky. Familiarity information: SKY-BLUE used as an adjective is very rare.