The window was covered with a thick layer of dust.

Meaning: The window was completely covered with a deep layer of dust, indicating it had not been cleaned for a while.

Choice of Words: Covered means to put something over something else, usually completely. Thick describes something as being deep or having a large amount of material. Layer refers to a flat area of something that covers a surface. Dust is a fine powder that settles on surfaces over time.

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Related Expressions