Sideline, Side line n.
  1. (a) A line pertaining or attached to the side of a thing. (b) Specif., a line for hobbling an animal by connecting the fore and the hind feet of the same side.
  2.  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.
  3. A secondary road; esp., a byroad at right angles to a main road. [Canada]
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