brush (something) up

(This phrasal verb has more than one meaning)
Definition: to improve your knowledge or skill in a subject that you have not studied or practised for a period of time.
E.g.1: I want to brush up my English because, although I learnt it when I was at school, I haven’t studied it for 5 years.
E.g.2: I haven’t studied chemistry since I was at university – I’d have to brush it up before I could teach it.
This phrasal verb can be separated. (E.g. 2)

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