翻手為雲覆手變雨 [－－为云－－变－]

Jyutping faan1 sau2 wai4 wan4 fuk1 sau2 bin3 jyu5
Pinyin fān shǒu wéi yún fù shǒu biàn yǔ

Definitions (CC-CEDICT)
  1. lit. turning his hand palm up he gathers the clouds, turning his hand palm down he turns them to rain
  2. very powerful and capable (idiom)