A deep-seated hatred or grudge that has lasted for a very long time, often spanning many generations.
由于一场古老的家族纷争，两家人之间积压了九世之仇，使得后代们也难以放下。
Due to an ancient family dispute, a nine-generation hatred accumulated between the two families, making it difficult for future generations to let go.
Era:
Ancient
Frequency:
Synonym:
Story:
During the Spring and Autumn period, Duke Ai of Qi, a vassal state, was executed by the Zhou Emperor because Duke Hou of Ji, the ruler of another vassal state, had slandered him to the Emperor.
The subsequent rulers of Qi never forgot this grievance.
It was not until Duke Xiang of Qi, the ninth descendant of Duke Ai, mobilized his army to attack and ultimately destroy the state of Ji, thereby settling this "nine-generation feud."
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