Clouds sail skyward.
Meaning: This means that the clouds are moving smoothly upwards in the sky, as if they were floating on water.
Choice of Words: Clouds are large collections of water droplets or ice crystals that float in the sky. Sail is a verb that means to move smoothly through water using the wind. Skyward is a directional term that means towards the sky. When you put them together, "Clouds sail skyward" is a poetic way to describe the movement of clouds in the sky.
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Related Expressions