一手遮天

一手遮天 (Pinyin: yīshǒuzhētiān) word-for-word means "one hand block sky" or, loosely translated, "blocking the sky with one hand":

• 一 = "one"
• 手 = "hand"
• 遮 = "block"
• 天 = "sky"

This Chinese phrase hints at the futility of hiding the truth from the masses, by alluding to the delusional idea of blocking the entire sky (from others) with just one's own hand!

It can also extend to apply to all kinds of futility when it comes to covering something up ;)