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Phrase(s): Good fences make good neighbors.
Prov. It is easier to be friendly with your neighbor if neither of you trespasses upon the other’s property or privacy. • Jane: The guy next door is letting his party guests wander across our lawn again. Alan: I guess we’ll have to build a fence there. Good fences make good neighbors, like they say.
McGrawhill's American Idioms And Phrasal Verbs