The phrasal verb Break down + noun can be used to talk about analysing something in detail: "You need to break down the maths problem in order to solve it properly."
Break down is also used to talk about something that has stopped working properly: "Can you please come and pick me up from work? My car has broken down."
We can also use Break down to describe crying: When she found out the news of her friends death she broke down in tears.
