Question 1

What does "brush up" mean?

Accepted Answer

To improve or refresh a skill or area of knowledge that has become rusty through lack of practice.

Question 2

How do you use "brush up" in a sentence?

Accepted Answer

I need to brush up on my Spanish before the trip to Mexico.

Question 3

Is "brush up" formal or informal?

Accepted Answer

"brush up" is register-neutral — appropriate in both casual and formal contexts. Very common in everyday and educational English. Almost always followed by 'on' when the object is a topic ('brush up on your French') or used reflexively ('brush up your skills'). The 'up' suggests the idea of polishing or bringing something back up to a good standard.

brush up

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