Definition of brush up phrasal verb from the Oxford Advanced American Dictionary

 

brush up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

brush somethingup

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brush up on something

 
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to quickly improve a skill, especially when you have not used it for a time I need to brush up on my Spanish before I go to Seville.
See the Oxford Advanced Learner's Dictionary entry: brush up