Clouds cover moon.
Meaning: This means that the clouds are blocking the view of the moon from where you are. It's like saying, The moon is hidden behind the clouds.
Choice of Words: Clouds are large groups of water droplets or ice crystals that float in the sky. Cover is a verb that means to place something over the top of something else to protect or hide it. When you put them together, "Clouds cover moon" describes the clouds as if they are hiding the moon from view.
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Related Expressions