遮天蔽日

zhētiānbìrì
  1. lit. hiding the sky and covering the earth (idiom); fig. earth-shattering
  2. omnipresent
  3. of universal importance

CEDICT

extremely strong and vast

Wiktionary

掩蔽天空，阻隔日光的照射。形容气势浩大，为数极多。

重編國語辭典

Entry Composition

1 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)
2 蔽日 bìrì
  1. (literary) to block out light from the sun
  2. to block out light from the sun

Related entries

无所不在 wúsuǒbùzài omnipresent
漫山遍野 mànshānbiànyě
  1. lit. covering the mountains and the plains (idiom)
  2. fig. as far as the eye can see
  3. covering everything
  4. omnipresent