jǐng​shuǐ​bù​fàn​hé​shuǐ

to mind one's own business

Senses

井水不犯河水 jǐng​shuǐ​bù​fàn​hé​shuǐ (also jǐng​shuǐ​bú​fàn​hé​shuǐ) to mind one's own business

Literally "well water does not interfere with river water"; used to describe people or groups that have clear boundaries and do not interfere with each other.

References

same_as 河水不犯井水/河水不犯井水 井水不犯河水/井水不犯河水