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The Collaborative International Dictionary
Side line

Sideline \Sideline\, Side line \Side line\

    1. A line pertaining or attached to the side of a thing.

    2. Specif., a line for hobbling an animal by connecting the fore and the hind feet of the same side.

    1. 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.

    2. A secondary road; esp., a byroad at right angles to a main road. [Canada]

Wikipedia
Side Line

SIDE LINE is the fourth studio album by Japanese pop group Onyanko Club. It was released on February 21, 1987 through Canyon Records in LP and CD format. It peaked at number one on the Oricon charts and sold a total of 69,000 copies.