brush up on

brush up on

释义：“温习”，常在留学文书中用来描绘抱佛脚式提升技能或者掌握具体知识，用以达成特定的目的。

例句：
You have to brush up on the metric system if you're going to work in Canada.
These Scouts were brushing up on their orienteering skills and getting ready to compete in a wilderness race.