Cách sử dụng
The expression "tell on" means to inform someone in authority about something that someone else has done wrong or bad. For an English learner, this expression can be used in situations where they need to report someone who has done something wrong or inform someone in charge about a problem or an issue. For example, they can say "I'm going to tell on him to the teacher for cheating" or "She told on us for breaking the window."