brush up (on) sth Meaning in Cambridge English Dictionary
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Meaning of "brush up (on) sth" - English Dictionary

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brush up (on) sth

phrasal verb with brush uk   us   /brʌʃ/ verb
C1 to improve your knowledge of something already learned but partly forgotten: I thought I'd brush up (on) my French before going to Paris.
(Definition of brush up (on) sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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