1.Lit. to cause something to fall onto one's head. (See also bring something crashing down (around one).) He jarred the shelves and all the books were brought down on his head.When he hit the wall of the hut, he brought down the roof on himself.
2.Fig. to cause the collapse of something or some enterprise onto oneself. Your bumbling will bring everything down on your head!Your mistakes have brought down the whole thing on your own head.