Cách sử dụng
"Call in" is a phrasal verb that means to ask someone to come to a place for a specific purpose or to contact someone for a specific reason. For example, if you are sick, you can "call in" to your workplace to let them know that you won't be coming in. Or if you need help with a problem, you can "call in" a friend to give you advice. It can also refer to inviting someone to attend or participate in something, like "calling in" an expert to give a presentation. So, "call in" means inviting or requesting someone to take part in something or to ask for help.