Brush up(To). To renovate or revive; to bring again into use what has been neglected, as, “I must brush up my French.” When a fire is slack we brush up the hearth and then sweep clean the lower bars of the stove and stir the sleepy coals into activity. Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Brush up from Fact Monster:
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