line

A path through two or more points (compare ‘segment’); a continuous mark, including as made by a pen; any path, curved or straight.

"The arrow descended in a curved line."

A rope, cord, string, or thread, of any thickness.

A hose or pipe, of any size.

"a brake line"

To place (objects) into a line (usually used with "up"); to form into a line; to align.

"to line troops"

To place persons or things along the side of for security or defense; to strengthen by adding; to fortify.

"to line works with soldiers"

To form a line along.