一手遮天

yīshǒuzhētiān
  1. lit. to hide the sky with one hand
  2. to hide the truth from the masses

CEDICT

to hide the truth (from the public or masses)

Wiktionary

比喻玩弄权术、瞒上欺下的行径。

重編國語辭典

Entry Composition

1 一手 yīshǒu
  1. a skill
  2. mastery of a trade
  3. by oneself
  4. without outside help
2 遮天 zhētiān
  1. (literary) to block out the sky (describing a vast number of objects)
  2. to block out the sky (describing a vast number of objects)