Clear skies.
Meaning: This means that the sky is free from clouds or obstruction and is easy to see. It's like saying, The sky is very clear and you can see the stars easily.
Choice of Words: Clear is an adjective that means free from clouds or obstruction. Skies is a noun that refers to the expanse of space that is visible from the earth. When you put them together, "Clear skies" refers to an expanse of space that is free from clouds or obstruction and is visible from the earth.
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