Sun brightens sky.
Meaning: This means that the sun is making the sky become light and bright as it rises. It's like saying, The sky becomes light and cheerful as the sun comes up.
Choice of Words: Sun is the star at the center of our solar system that provides heat and light. Brightens is a verb that means to make something lighter or more cheerful. Sky is the expanse of space that you can see from Earth, including the air and everything in it. In this case, it refers to the space above us that becomes light as the sun rises.
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Related Expressions