noun
a brief review or practice to refresh one's memory or skill
verb
to improve or refresh one's knowledge or skills in a particular subject
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I need to brush up on my knowledge of the new tax laws before the meeting.
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I should brush up on my guitar skills before the talent show.
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I better brush up on my dance moves if I want to impress at the party.
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After years of not speaking, it was time to brush up on our friendship and reconnect.