Expand vocabulary.
Meaning: This means to learn new words and improve your understanding of language. It's like saying, Make an effort to learn new words every day.
Choice of Words: Expand is a verb that means to make something larger or more extensive. Vocabulary is a noun that refers to a collection of words that a person knows or uses. When you put them together, "Expand vocabulary" is an instruction to increase the number of words you know.
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