brush up on something Meaning in the Cambridge English Dictionary
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Meaning of “brush up on something” in the English Dictionary

"brush up on something" in American English

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brush up on something

phrasal verb with brush  us   /brʌʃ/ verb
to ​improveyourknowledge of something already ​learned but ​partlyforgotten: You’d ​better brush up on ​yourFrench before going to ​Paris.
(Definition of brush up on something from the Cambridge Academic Content Dictionary © Cambridge University Press)
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