铁嘴钢牙 iron mouth steel teeth
Explanation
形容人能言善辩，口齿伶俐，辩论时理直气壮，令人信服。
Describes a person who is eloquent and persuasive in argument, and their arguments are convincing.
Origin Story
话说唐朝时期，有个名叫李白的诗人，以其才华横溢而闻名于世。他不仅诗写得好，而且口才也极佳。一次，他与一位名士在酒楼上饮酒作乐，席间两人发生了激烈的辩论。这位名士口若悬河，引经据典，试图以其渊博的知识压倒李白。然而，李白却毫不示弱，他妙语连珠，引古论今，论证精辟，令人叹服。最终，这位名士败下阵来，心悦诚服地承认李白的才华。从此，李白“铁嘴钢牙”的名号便在文坛广为流传。
It is said that during the Tang Dynasty, there was a poet named Li Bai, who was known for his extraordinary talent. He was not only a great poet, but also extremely eloquent. Once, he and a famous scholar were drinking and having fun in a restaurant, and during the banquet, the two had a heated debate. The scholar spoke eloquently, quoting classics and scriptures, attempting to overwhelm Li Bai with his extensive knowledge. However, Li Bai was not to be outdone; he responded with wit and wisdom, discussing both ancient and modern times, and his arguments were incisive and impressive. Eventually, the scholar was defeated, and he humbly admitted Li Bai's talent. From then on, Li Bai's reputation as a "silver-tongued orator" spread throughout the literary world.
Usage
多用于形容人能言善辩，口才好。
Mostly used to describe a person who is eloquent and persuasive.
Examples
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他口才极好，简直是铁嘴钢牙。
tā kǒucái jí hǎo, jiǎnzhí shì tiě zuǐ gāng yá
He has an excellent eloquence, he is simply a silver-tongued orator.
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面对对手的步步紧逼，他凭借着铁嘴钢牙，巧妙地化解了危机。
miànduì duìshǒu de bùbù jǐnbī, tā píngjièzhe tiě zuǐ gāng yá, qiǎomiào de huàjiěle wēijī
Faced with the opponent's step-by-step pressure, he skillfully resolved the crisis with his sharp tongue and powerful arguments.