讳莫如深 keep mum
Explanation
讳莫如深，指隐瞒事情真相，秘而不宣。
Hui Mo Ru Shen means to conceal the truth of a matter and keep it secret.
Origin Story
春秋时期，鲁国发生了一系列的权力斗争。鲁庄公偏爱孟任及其儿子般，想立般为太子，而庆父和叔牙则各有打算。为了争夺王位，他们之间展开了一场你死我活的斗争。叔牙被杀，般继位，但不久也被庆父杀死，最终庆父篡位。这段历史充满了血腥和阴谋，由于过于残酷和复杂，孔子在《春秋》中对此事只字未提，这便是“讳莫如深”的由来。历史的真相被刻意掩盖，后人只能从零星的记载中推测当时的情形，这也反映了当时政治斗争的残酷性和复杂性。
During the Spring and Autumn period, a series of power struggles occurred in the state of Lu. Duke Zhuang of Lu favored Meng Ren and her son Ban, wanting to make Ban the crown prince, while Qing Fu and Shu Ya each had their own plans. In order to seize the throne, they launched a life-or-death struggle. Shu Ya was killed, and Ban succeeded to the throne, but was soon killed by Qing Fu, who finally usurped the throne. This history was filled with blood and intrigue, and because it was too cruel and complicated, Confucius made no mention of it in the Spring and Autumn Annals. This is the origin of "Hui Mo Ru Shen". The truth of history was deliberately concealed, and later generations could only speculate on the situation at that time from scattered records. This also reflects the cruelty and complexity of political struggles at that time.
Usage
用于形容对某些事情隐瞒真相，秘而不宣。
Used to describe concealing the truth of something and keeping it secret.
Examples
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对于这件事，他讳莫如深，不肯多说。
Duì yú zhè jiàn shì, tā huì mò rú shēn, bùkěn duō shuō。
He kept mum about this matter, refusing to say more.
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这件事的真相，他们讳莫如深，让人难以捉摸。
Zhè jiàn shì de zhēnxiàng, tāmen huì mò rú shēn, ràng rén nán yǐ zhuōmó。
The truth of this matter was kept secret, making it difficult to grasp.