江水不犯河水

jiāngshuǐbùfànhéshuǐ ㄐㄧㄤ ㄕㄨㄟˇ ㄅㄨˋ ㄈㄢˋ ㄏㄜˊ ㄕㄨㄟˇ

    • to keep to oneself and not interfere with each other
    • to mind one's own business

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
big-river water doesn't encroach on river water
Meaning
A variant of the usual 井水不犯河水: each side keeps to itself and does not interfere with the other.

Sources