"across the lines" is grammatically correct and usable in written English.
For example, you could use this phrase to describe a journey: "We traveled across the lines to get to the nearby town."
When the lines are farther apart, the shape of the terrain is shallow, and changes slowly (TRACE PERPENDICULAR ACROSS THE LINES).
When the lines are closer together, the 3D shape of the terrain is steep, and changes quickly (TRACE PERPENDICULAR ACROSS THE LINES).
When the lines are closer together, the elevation is changing quickly, meaning the region has a steep slope (TRACE PERPENDICULAR ACROSS THE LINES).
When the lines are farther apart, the elevation is changing slowly, meaning the region has a shallow slope (TRACE PERPENDICULAR ACROSS THE LINES).
But the Government has declined to allow the United Nations to carry food across the lines.
Driving up into them is easy, not an endless journey of uncertain outcome across the lines.
Such an admission could be construed as betrayal by the neighbors across the lines.
Join us if you are ready to go beyond "preaching to the choir" and lead change across the lines.
To be the most effective, digital activists need to work together across the lines of tactics and strategy.
He did not write from left to right or right to left but diagonally, across the lines.
The voters – in Britain, and let's hope America too – are ultimately with Bush and Clinton, hugging across the lines.
