·add. ·- A line pert. or attached to the side of a thing.
II. Side line ·add. ·- A secondary road; ·esp., a byroad at right angles to a main road.
III. Side line ·add. ·- Specif., a line for hobbling an animal by connecting the fore and the hind feet of the same side.
IV. Side line ·add. ·- A line of goods sold in addition to one's principal articles of trade; a course of business pursued aside from one's regular occupation.