douczyć v angličtině:

I need to brush up my Spanish.

He went to Canada to brush up on his French before the exam.

He went to France to brush up on his French before the exam.

I will need to brush up my English before I go on holidays.

There was no time to brush up on the language.

I want to brush up my English.

brush up on Maths

I think I should brush up a bit on my Japanese before visiting Osaka.

I need to brush up on my Spanish, because I had quite a long break

So, brush up on the English that you started learning long ago, or start learning today.