Definition of "border on" [border on]

• To be almost like some other thing. (verb)

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• "In a space of one inch square were counted no less than 158 interlacings of white ribbon with a black border on either side."
• "The Duke of Mantua was one of those strange loaded dice that Fate occasionally flings upon this checkerboard of time: one of those characters whose feverish faculties border on madness, yet who do the world great good by breaking up its balances, preventing social ankylosis, and eventually forcing upon mankind a new deal."
• "THERE is a large space betwixt this chain of seacoast-islands and the main land, perhaps generally near three leagues in breadth; but all this space is not covered with water: I estimate nearly two thirds of it to consist of low salt plains, which produce Barilla, Sedge, Rushes, &c. and which border on the main land, and the western coasts of the islands."