Cách sử dụng
The expression "build up" means to increase gradually. It can be used in a variety of contexts, such as in reference to something physical, like a pile of blocks, or something more abstract, like emotions or confidence. For example, you could say "I need to build up my strength by going to the gym regularly" or "I am trying to build up my confidence before speaking in public." Overall, "build up" suggests a slow and steady process of growth or improvement.