brush up on
phrasal verbbrush something up | brush up on something
- to quickly improve a skill, especially when you have not used it for a time
快速提高；重温（生疏了的技术等） - I must brush up on my Spanish before I go to Seville.
我去塞维利亚之前一定得好好温习我的西班牙语。
- I must brush up on my Spanish before I go to Seville.