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English definition of “brush up (on) sth”

brush up (on) sth

verb uk phrasal verb with brush   /brʌʃ/ us  
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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