Cách sử dụng
The expression "dust down" means to clean something by removing any dust or dirt that is on it. This expression can be used in different situations like cleaning a dirty object or piece of furniture before using it or preparing to use it after a long time of not being used. For example, if you want to use an old book that has been sitting on the shelf for a long time, you might say "I need to dust down this old book before I start reading it."