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During the Tang Dynasty, not long after the great poets Li Bai and Du Fu had passed away, some individuals began to groundlessly disparage their literary works.
Han Yu, a prominent writer of the time, was greatly displeased by this. He then wrote a poem to his friend Zhang Ji, titled "Tiao Zhang Ji" (调张籍), expressing his strong disapproval.
In the poem, he wrote, "Li and Du's literary works endure, their brilliance shines for ten thousand zhang (an ancient unit of length); unaware are these foolish youngsters, why then do they maliciously defame them? Ants trying to shake a great tree \u2013 how laughable their overestimation of themselves."
Zhang Ji readily agreed with Han Yu's sentiments.

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Open the tool →撼树蚍蜉 (hàn shù pí fú) is a Chinese idiom (chengyu) meaning “to ridiculously overrate oneself”.
撼树蚍蜉 is pronounced hàn shù pí fú in Mandarin Chinese.
Literally, 撼树蚍蜉 means “an ant trying to shake a tree”. It is used to mean “to ridiculously overrate oneself”.
撼树蚍蜉 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
撼:摇动。蚍蜉:大蚂蚁。想把大树摇动的大蚂蚁。比喻自不量力者。