Clean house.
Meaning: This means to make your house neat and tidy by removing any dirt or impurities that may have accumulated. It's like saying, Please make sure that your house is free from dirt and impurities.
Choice of Words: Clean is a verb that means to make something free from dirt or impurities. House is a building where people live. When you put them together, "Clean house" is a command asking someone to make the entire house free from dirt or impurities.
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