Cách sử dụng
The expression "be up to somebody" means that a decision or responsibility is in someone's hands or that they are responsible for taking action in a particular situation. For example, if there is a task that needs to be done but no one has taken charge, you could say, "It's up to someone to make a plan and get it done." It's a way to emphasize that the outcome is dependent on someone taking action or making a decision.