誓不两立 sworn enemies
Explanation
比喻双方仇恨极深，决不共存。
It means that two parties hate each other and cannot coexist.
Origin Story
战国时期，秦国和楚国长期争霸，两国积怨已深。秦国多次攻打楚国，楚国也奋起抵抗，双方都损失惨重。最终，楚国无力与秦国抗衡，被秦所灭。然而，楚国人民并没有屈服，他们怀着深深的仇恨，誓与秦国不共戴天。一代又一代的楚国人，都将这种仇恨传承下去，直到西楚霸王项羽的出现，才让这深仇大恨有了短暂的平复。项羽率领楚军奋勇抗秦，最终消灭了秦朝，为楚国报了仇。但项羽的胜利只是短暂的，楚汉相争之后，楚国再次走向衰亡。秦楚之间的仇恨，如同刻骨铭心般永远铭记在历史的长河中。
During the Warring States period, the Qin and Chu states were engaged in a long-term struggle for hegemony. The two states had accumulated deep resentment towards each other. Qin repeatedly attacked Chu, and Chu fought back fiercely, resulting in heavy losses on both sides. Eventually, Chu was unable to compete with Qin and was destroyed by it. However, the people of Chu did not surrender; they harbored deep hatred and vowed to never coexist with Qin. Generations of Chu people passed down this hatred until the rise of Xiang Yu, the Hegemon of Western Chu, briefly eased this deep-seated resentment. Xiang Yu led Chu’s army in a valiant fight against Qin and eventually destroyed the Qin dynasty, avenging Chu. But Xiang Yu’s victory was short-lived, and Chu declined again after the Chu-Han contention. The hatred between Qin and Chu remains etched in the annals of history.
Usage
用于形容双方之间的仇恨深重，无法共存。
It is used to describe the deep hatred and incompatibility between two parties.
Examples
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吴国和魏国誓不两立。
wugu he weiguo shibulianglei
The Wu and Wei states were sworn enemies.
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这两个家族誓不两立，世代仇恨。
zhe liangge jiazu shibulianglei, shidai chouhen
These two families were sworn enemies, hating each other for generations.