Tā huāngmáng bǎ xìn cáng qǐlai, fǎn'ér yùgài-mízhāng.
She hurriedly hid the letter, which only made it more obvious.
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From 《左传·昭公三十一年》: 或欲盖而名章 ('some try to conceal, yet their name becomes famous'). Originally moral commentary: you can't hide an act of injustice - trying to will only expose it more.