Cách sử dụng
"Mouth off" means to speak in an impolite or disrespectful way, especially when someone is angry or frustrated. It is often used when someone speaks too loudly or aggressively without thinking about the consequences. For example, if a person tells their boss to "shut up" during a meeting, they are "mouthing off". This expression can be used in informal situations with friends or family, but it is not appropriate to use it in formal settings such as school or work.