Sky brightens.
Meaning: This means that the sky is becoming lighter or brighter, often due to the rising sun. It's like saying, The sky is becoming more illuminated as the day starts.
Choice of Words: Sky is the space above the earth's surface as far as the eye can see. Brightens is a verb that means to become lighter or more illuminated. Here, it refers to the gradual lightening of the sky as the day begins.
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Related Expressions