Cách sử dụng
The expression "brush up" means to improve or refresh one's knowledge or skills in a particular area. For example, if you haven't practiced speaking English in a while, you might need to "brush up" on your conversation skills before an important interview or meeting. It's a way of saying that you want to review and work on something in order to make it better or sharper. You can use this expression in many different contexts, such as when studying for a test, preparing for a job interview, or trying to improve a hobby or skill.