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During the Spring and Autumn period, Gongzi Ziguo and Gongzi Zier of the Zheng state launched a military campaign against the Cai state and achieved victory.
Ziguo's son, Zichan, was deeply concerned, fearing that the Chu state would retaliate against Zheng. Later, King Zhuang of Chu dispatched Gongzi Zhen to lead his troops to attack Zheng.
The then-ruler of Zheng, Zisi, cited a line from an ancient Zhou poem: 'How long must one wait for the Yellow River to clear? How long is a human life?' He used this to express the futility of prolonged resistance and advocated for surrendering to Chu, suggesting that waiting for a more favorable outcome was an impossibly long and unwise endeavor.

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Open the tool →河清难俟 (hé qīng nán sì) is a Chinese idiom (chengyu) meaning “to describe an impossibly long wait”.
河清难俟 is pronounced hé qīng nán sì in Mandarin Chinese.
Literally, 河清难俟 means “Hard to wait for the Yellow River to clear”. It is used to mean “to describe an impossibly long wait”.
河清难俟 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
俟:等待。很难等到黄河水清。比喻时间太长,难以等待。