Cách sử dụng
"Sign up" means to register or join something. For example, if you wanted to join a club or a gym, you would need to "sign up" by filling out a form or providing your information. You might also "sign up" for a class or an event by registering in advance. The expression "sign up" is commonly used in everyday conversation and is a helpful phrase to know when looking to become a part of a group or activity.