brush up on (something) - to review something that one has already learned

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What is brush up on (something)?
brush up on (something) is " to review something that one has already learned", under brush-up-on-(something)
brush up on (something) Definition / brush up on (something) Means
The definition of brush up on (something) is " to review something that one has already learned"
The Meaning of brush up on (something)
brush up on (something) means " to review something that one has already learned"
Other definition of brush up on (something)?
We've found a total of 1 definitions for brush up on (something) brush up on (something) to review something that one has already learned in Idioms

What does brush up on (something) in Idioms_brush stand for?