The soldiers fought bravely on the front lines.

The artist used bold and colorful radical lines in their painting.

The flight lines at the airport were busy with planes taking off and landing.

The phone lines were down due to a storm.

I prefer using land lines for important calls.

I have noticeable tan lines from spending too much time in the sun.

The power-lines stretched across the countryside.

The power lines stretched across the horizon.

The point-in-lines are intersecting at a single point.

There are several fault lines in this region.