九世之仇 Nine generations' feud
Explanation
九世之仇指的是延续了九代人的仇恨，形容仇恨的持续时间极长，仇恨非常深重。
Nine generations' feud refers to the hatred that has lasted for nine generations, describing the extremely long duration and the deep intensity of hatred.
Origin Story
春秋时期，齐国与纪国长期存在矛盾。齐哀公时期，纪侯向周天子进谗言，导致齐哀公被杀。此后，齐国历代君主都将此仇记在心中。九代之后，齐襄公终于兴兵伐纪，灭掉了纪国，报了这九世之仇。这场旷日持久的仇恨，如同一条暗流，贯穿了数百年历史，最终以齐国的胜利而告终。齐国百姓欢欣鼓舞，而这个故事也成为了后世警示世人，勿以善小而不为，勿以恶小而为之的典范。仇恨的种子一旦种下，如同野草般疯长，最终只会带来无尽的痛苦与毁灭。齐襄公虽然报了仇，但他也明白，这九世之仇带来的并非真正的胜利，而是无尽的杀戮和悲伤。
During the Spring and Autumn period, the State of Qi and the State of Ji had long-standing conflicts. During the reign of Duke Ai of Qi, the Duke of Ji slandered Duke Ai to the Zhou King, resulting in Duke Ai's death. Afterwards, successive rulers of Qi kept this grudge in their hearts. After nine generations, Duke Xiang of Qi finally launched a military campaign against Ji, destroying the State of Ji and avenging this nine-generation feud. This long-lasting hatred, like an undercurrent, ran through hundreds of years of history, finally ending with Qi's victory.
Usage
用于形容持续时间很长，仇恨很深的仇恨。
Used to describe hatred that has lasted for a very long time and is very deep.
Examples
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这家族世代为仇，延续了九世之仇。
zhè jiāzú shìdài wèi chóu, yánxí le jiǔ shì zhī chóu
This family has been feuding for nine generations.
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为了报九世之仇，他们不惜一切代价。
wèile bào jiǔ shì zhī chóu, tāmen bùxī yīqiè dàijià
To avenge the feud of nine generations, they spared no expense.