Cách sử dụng
The expression "sign on" is usually used when someone joins a group or an organization. For example, if you want to join a club, you may be asked to "sign on" by filling out a form or agreeing to certain rules. It can also refer to starting a new job, where you may be required to "sign on" by filling out paperwork and agreeing to terms and conditions. "Sign on" can be used both in formal and informal situations.