To brush up on is a phrasal verb which means to review and improve your knowledge of something.
For example, if you want to brush up on your knowledge of crime and criminal activity, I’d recommend viewing the TV shows, Breaking Bad, Boston Legal and CSI-Las Vegas, or you could review some crime vocabulary.
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Inglés Málaga PinterestI can't be bothered reading today! No problem, check out the Inglés Malaga Pinterest site: Look at a few pictures, eat some mushrooms and soak up new words, phrases and grammatical structures without getting a sweat on! Inglés Málaga Pinterest