Emotional color: a derogatory term
Idiom structure: subject-predicate type
The source of the allusion: Tang Yunzhou's "Seven Swords and Thirteen Heroes" in the Qing Dynasty 103: "Unexpectedly, the strength of the war horse was exhausted, and the horse suddenly lost its front hoof and the sea was thrown off the horse."
Example of Idiom: Chapter 23 of Jin Yuzhou's Zhao Kuangyin: "Unfortunately, Zhao Kuangyin's war horse stepped into the mud pit and fell into the water."