There are multiple lines of thought on how to approach this problem.

The trunk lines connect major cities in the country.

The side-lines of the soccer field were filled with cheering fans.

The coach side-lines the player for his poor performance.

The side lines of the soccer field were clearly marked.

The referee side lines the player for a foul.

The cork lines were used to mark the boundaries of the playing field.

The lead lines are used to measure the depth of the water.

The artist drew several short lines on the canvas.

The artist created intricate and beautiful complex lines in their artwork.