Cách sử dụng
The expression "it isn't on" means that something is not possible or acceptable. You would use this expression when you want to say that something is not going to happen or that it is not allowed. For example, if someone asks you if you want to go for a swim, but you don't have a swimsuit, you could say "Sorry, it isn't on. I don't have a swimsuit." Another example is if someone suggests doing something that is against the rules, you could say "That isn't on. We could get in trouble."