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In the late Spring and Autumn period, King Fuchai of Wu was preparing to attack the State of Qi. King Goujian of Yue came to pay homage with his officials and generous gifts, which made Fuchai very pleased.
Wu Zixu, a minister of Wu, believed that attacking Qi would be of little use, and that the State of Yue was currently the greatest internal threat to Wu. Fuchai completely ignored his advice.
A few years later, while Wu was campaigning north against the State of Jin, Yue seized the opportunity to attack Wu and completely defeated it.

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Open the tool →心腹之患 (xīn fù zhī huàn) is a Chinese idiom (chengyu) meaning “a serious hidden danger or internal threat”.
心腹之患 is pronounced xīn fù zhī huàn in Mandarin Chinese.
Literally, 心腹之患 means “Hidden trouble in the vitals”. It is used to mean “a serious hidden danger or internal threat”.
心腹之患 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
心腹:比喻要害。比喻隐藏在内部的严重祸害。也泛指最大的隐患。