翻手为云覆手变雨

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
• 为(wéi)as (in the capacity of)
• 云(yún)say
• 覆(fù)cover
• 手(shǒu)hand
• 变(biàn)change
• 雨(yǔ)rain