【解释】比喻互不干犯。
河水和井水各不相干。比喻界限分明,互不干犯。如:「我做我的,你做你的,咱们彼此河水不犯井水!」也作「井水不犯河水」。
英语 lit. river water does not interfere with well water (idiom)?; Do not interfere with one another., Mind your own business.