Como digo em Inglês: Fazer arrodeios num assunto?

I'd like to use a very easy word to talk about a phrasal verbs that can be very useful in our everyday conversations. The word is TALK. It can be one of the very first words that a student comes to learn in English language. It only becomes a problem if we get stuck in its very basic meaning, which is to communicate or exchange ideas, and forget TALK can also be used in a variety of ways.

Let's suppose you once had a teacher that was a little bit of a "know-it-all', that is to say, she knew about everything and made a point to show it off. The problem is that everytime she was supposed to talk about a specific subject, she would never focus on it. Instead, she would get distracted by other subjects related to the first one and never got to the point. You thought it was very frustrating because after so much talking you didn't even remember what the main point was all about. While talking to one of your classmates about it, you ask him if he feels the same. He replies: I don't even pay attention to what she says anymore because I know she will get around the subject but never get to the point. If you see people getting around a subject, it means they're speaking indirectly about it. Maybe they get easily distracted while talking or they simply don't know the subject in depth.