It means that two parties should mind their own business and not interfere with each other. It's a way of establishing clear boundaries and peaceful coexistence.
This saying comes from the natural separation of well water (groundwater) and river water (surface water). It's a common metaphor for maintaining social distance and avoiding conflict.
It's a polite but firm way to establish boundaries. It signals a desire for non-interference and mutual respect, which is often seen as a practical way to maintain harmony in a crowded society.
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