Video narration
If your phone stops working, you know it has broken down. But English gets confusing because "break down" does not always mean the same thing. "My car broke down" means the car stopped working. Nothing is being broken into pieces. Now change the context: "The teacher broke down the problem." Here, break something down means explain it in smaller, easier parts. With a person, "She broke down" means she lost emotional control because the situation was too difficult. A conversation can break down too: "The talks broke down" means they failed. So the phrase does not have one fixed meaning. The words around it tell you what happened: did a machine stop, did someone separate an idea into parts, or did a person or discussion fail? When you see "break down," look at the situation. The context shows you which meaning is working.