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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 brush up
 溫習,改良,熟練

From: WordNet (r) 2.0

 brush up
      v 1: refresh one's memory; "I reviewed the material before the
           test" [syn: review, refresh]
      2: bring to a highly developed, finished, or refined state;
         "polish your social manners" [syn: polish, round, round
          off, polish up]