Word Study
blue sky
ROGET THESAURUS
blue sky
Air
N air, common air, atmospheric air, atmosphere, aerosphere, open air, sky, welkin, blue sky, cloud, weather, climate, rise and fall of the barometer, isobar, aerology, aerometry, aeroscopy, aeroscopy, aerography, meteorology, climatology, pneumatics, eudioscope, baroscope, aeroscope, eudiometer, barometer, aerometer, aneroid, baroscope, weather gauge, weather glass, weather cock, exposure to the air, exposure to the weather, ventilation, aerostation, aeronautics, aeronaut, containing air, flatulent, effervescent, windy, atmospheric, airy, aerial, aeriform, meteorological, weatherwise, in the open air, a la belle etoile, al fresco, sub jove dio.For further exploring for "blue sky" in Webster Dictionary Online