千真万确 absolutely true
Explanation
形容事情真实可靠，毫无疑问。
Describes something as absolutely true and reliable, without any doubt.
Origin Story
话说唐朝时期，长安城里有一位名叫李白的诗人，他的一首诗在民间广为流传，据说这首诗预言了未来的一场大旱。当时人们半信半疑，但李白却斩钉截铁地说："我所写之诗，字字珠玑，千真万确，旱灾必至！"果然，不出半年，一场百年不遇的大旱席卷了整个关中平原，百姓流离失所，哀鸿遍野。这场灾难让大家不得不相信李白的预言，从此以后，李白的诗句便被视为神谕，无人敢质疑其真实性。李白也因此名声大噪，被后世尊称为"诗仙"。
During the Tang Dynasty, a poet named Li Bai lived in Chang'an. One of his poems became widely circulated among the people, and it was said that this poem foretold a great drought in the future. At that time, people were half-believing and half-doubting, but Li Bai said resolutely: "The poem I wrote is true and accurate, the drought will come!" Sure enough, within half a year, an unprecedented drought swept across the entire Guanzhong Plain, and people were displaced and suffered. The disaster made everyone have to believe Li Bai's prediction, and since then, Li Bai's poems have been regarded as oracles, and no one dared to question their authenticity. Li Bai became famous for this and was later revered as the "Poetry Immortal".
Usage
主要用于强调事情的真实性，多用于口语。
Mainly used to emphasize the truthfulness of something, mostly used in spoken language.
Examples
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消息千真万确，毋庸置疑。
xiaoxi qianzhenwanque, muyongzhiyi
The news is absolutely true and beyond doubt.
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这件事千真万确，不容置疑！
zhe jianshi qianzhenwanque, burongzhiyi
This matter is absolutely true, beyond doubt!