Cách sử dụng
The phrase "frown upon" means that somebody or a group of people do not approve of something. For example, if someone speaks loudly in a library, it is something that people would frown upon because libraries are supposed to be quiet places. It is a negative reaction to something that someone did or something that is going on. It's a formal phrase used in professional settings, like the workplace or academics, and should generally be avoided in informal situations or with friends.