|—n , pl skies|
|1.||(sometimes plural) the apparently dome-shaped expanse extending upwards from the horizon that is characteristically blue or grey during the day, red in the evening, and black at nightRelated: celestial, empyrean|
|2.||outer space, as seen from the earth|
|3.||(often plural) weather, as described by the appearance of the upper air: sunny skies|
|4.||the source of divine power; heaven|
|5.||informal the highest level of attainment: the sky's the limit|
|6.||to the skies highly; extravagantly|
|—vb , skies, skies, skying, skied|
|7.||rowing to lift (the blade of an oar) too high before a stroke|
|8.||informal (tr) to hit (a ball) high in the air|
|Related: celestial, empyrean|
|[C13: from Old Norse skӯ; related to Old English scio cloud, Old Saxon skio, Old Norse skjār transparent skin]|
|sky (skī) Pronunciation Key
The atmosphere, as seen from a given point on the Earth's surface. The sky appears to be blue because the wavelengths associated with blue light are scattered more easily than those that are associated with the other colors.
out of a clear blue sky
Also, out of the blue. Without warning, suddenly, as in Her offer to help us with the fundraising came out of a clear blue sky, or We got a check from Aunt Ruby out of the blue. These metaphoric terms allude to something dropping unexpectedly from the sky. [Late 1800s] Also see out of nowhere.