The white clouds drifted across the blue sky.
Meaning: This sentence is describing white clouds moving slowly and gently from one side to the other in the blue sky.
Choice of Words: Drifted means to move slowly and gently in a particular direction. Across means from one side to the other. When you put them together, "Drifted across" means to move slowly and gently in a particular direction from one side to the other.
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Related Expressions