翻手為雲覆手變雨

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)

Character by character

• 翻(fān)turn over
• 手(shǒu)hand
• 為(wéi)as (in the capacity of)
• 雲(yún)surname Yun
• 覆(fù)cover
• 手(shǒu)hand
• 變(biàn)change
• 雨(yǔ)rain