boundary line
border ***
borderline
delimitation
mete

To my thinking, he had already passed the boundary line.

Be certain you know exactly where your boundary lines are.

"Most people believe they know where their boundary lines are," he said.

Let's just say they are no surprise to those of us who live at the boundary line.

Here lies the boundary line between going up or down.

Holding up the process have been the boundary line and the land settlement terms.

Today, for the very first time, I understood where the boundary line runs in our fight.

Baseline: The far boundary line at either end of the court.

It is not clear whether this was a boundary line or a defensive position.

They screamed across the boundary line on this issue for nearly a week.