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.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.