What does "even as parts of the world all but crumble on his watch." mean? President Obama surely has more than 99 problems — but here's one: He doesn't feel the need to even look like he gives a damn, even as parts of the world all but crumble on his watch. I don't know the politics of America well. Of course, I know President Obama. But, parts of the world all but crumble on his watch? Obama has to do with crumble on his watch? Has he ever cleaned his watch because of snack crumble? I know the meaning of parts of the world and I know all but means except for. But i don't know the meaning of "even as parts of the world all but crumble on his watch." Could you help me understand it?