- boundary line; frontier.
Origin of border line
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for border line
In cases on the border-line they might help to incline the balance.Mentally Defective Children
He remained on the border-line of civilisation and reminded us of what we had left.
We have said that Constantin was on the border-line of civilisation and reminded us of what we had left.
Well, it's practically impossible to patrol some of that border-line.The Light of Western Stars
Machu Picchu is on the border-line between the temperate zone and the tropics.Inca Land