Extremely Loud and Incredibly Close title significance??

So I looked online to see what people's opinion are on the meaning of the title and couldn't find anything. From what I gather, does the title mean that the tragedy/elephant in the room is "extremely loud and incredibly close" and no one talks about it or wants to talk about it? I have no idea. Maybe the meaning of the title is obvious but I can't think of anything. Does anyone know or have an opinion?