border line

boundary line; frontier.

Origin of border line

First recorded in 1865–70

He remained on the border-line of civilisation and reminded us of what we had left.

By Desert Ways to Baghdad |Louisa Jebb
It comprehends only the slopes on the west side to the border-line of the Flathead River.

Tenting To-night |Mary Roberts Rinehart
We have said that Constantin was on the border-line of civilisation and reminded us of what we had left.

By Desert Ways to Baghdad |Louisa Jebb
Thus the final idea came to him that they two had been near, very near, the border-line of convention.

The Barrier |Allen French

On the border-line of the Orient and Occident it is built, on the mountain-heights overlooking both.

The Book of Khalid |Ameen Rihani