to crumble and fall down; to collapse into ruins

The mysterious hermit of the Qin Dynasty who gave the military treatise [[太公兵法|太公兵法|tai4 gong1 bing1 fa3]] to [[张良|張良|zhang1 liang2]] on a bridge in Xiapi; he is also known as [[黄石公|黃石公|huang2 shi2 gong1]].