Cách sử dụng
The expression "ring off the hook" means that the phone is ringing very frequently and persistently. It's usually used to describe a situation where a person is receiving an overwhelming amount of phone calls in a short period of time, and the phone is ringing continuously. For example, if a receptionist at a busy office receives a lot of calls in a day, he or she might say, "The phone has been ringing off the hook all day!"