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thanks Hotdog, i've checked the books, there are books in the series called "Brush up your Shakespeare", "Brush up your Bible", "Brush up your mythology", etc.... At the same time there are books...

How do they say in modern English today? Brush up or Brush up on .... Which is correct "I need to brush up my Spanish" or "I need to brush up on my Spanish"?
All dictionaries I have checked say both...