[skahy] 
noun, plural skies, verb skied or skyed, sky⋅ing.| 1. | the region of the clouds or the upper air; the upper atmosphere of the earth: airplanes in the sky; cloudy skies. |
| 2. | the heavens or firmament, appearing as a great arch or vault. |
| 3. | the supernal or celestial heaven: They looked to the sky for help. |
| 4. | the climate: the sunny skies of Italy. |
| 5. | Obsolete. a cloud. |
| 6. | Informal. to raise, throw, or hit aloft or into the air. |
| 7. | Informal. to hang (a painting) high on a wall, above the line of vision. |
| 8. | sky up, Falconry. (of prey, when flushed) to fly straight upward. |
| 9. | out of a or the clear sky, without advance notice or warning; abruptly: An old beau phoned her out of a clear sky. Also, out of a or the clear blue sky. |
| 10. | to the skies, with lavishness or enthusiasm; extravagantly: to praise someone to the skies. Also, to the sky. |
sky
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| 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.