brush-up
/ˈbrʌʃʌp/noun
(一般作a brush-up)
1- Brit. an act of cleaning or smartening oneself or something up〈英〉梳洗打扮; 梳理：
he must want a wash and brush-up after the long journey.
一番长途跋涉之后他肯定需要好好梳洗打扮一番。
1.1
- usu. as modifier an act of improving one's previously good knowledge or skill at a particular thing温习, 复习：
a two-day brush-up course.
两天的温习知识的课程。