When he refused to hand over the money, the robbers threatened to blow his brains out.他拒绝把钱交出来，抢劫者就威胁要开枪打得他脑袋开花。Defy me and I'll pistol your brains out the back of your head.胆敢违抗，我就用手枪打你个脑袋开花。He put a gun to his head and threatened to blow his brains out.他用枪指着他的头，威胁说要让他脑袋开花。