also: ボーダー・ライン
borderline; boundary line
Used for a dividing line between two areas, categories, or states. Often carries a nuance of a threshold or limit.
What is the borderline between pass and fail?
This river forms the border line between the two countries.
His score went above the passing borderline.
His grades are right on the borderline, so it's still unclear whether he'll pass.
I heard that 70 points is the cutoff line this year.
There was a debate over where to draw the borderline.