Pinyin: [Xu Shang JiāShuāng]
Source: Songshi Daoyuan "Jingde Dengchuan Record" Volume 19: "What makes you know is still too much."
Interpretation: Metaphorically, successive disasters make the damage more serious.
Synonyms: take advantage of the fire to rob/take advantage of the danger of others/add fuel to the fire/avoid the pit and fall into the well.
Antonym: timely help/icing on the cake/double happiness.