From The Collaborative International Dictionary of English v.0.44 [gcide]:
Sideline \Sideline\, Side line \Side line\ 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. [Webster 1913 Suppl.]
2. (a) 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. (b) A secondary road; esp., a byroad at right angles to a main road. [Canada] [Webster 1913 Suppl.]
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
73 Moby Thesaurus words for "sideline": avocation, bank, board, border, bordure, brim, brink, brow, by-line, catalog goods, coast, commodities, consumer goods, consumer items, delay, edge, effects, featheredge, flange, frame, fringe, goods, goods for sale, hem, hobby, hobbyhorse, inventory, job lot, labellum, labium, labrum, lay aside, lay away, lay by, ledge, limb, limbus, line, line of goods, lip, list, mail-order goods, marge, margin, merchandise, pastime, pigeonhole, postpone, push aside, put aside, put away, put in mothballs, ragged edge, rim, selvage, set aside, set by, shelve, shore, side, side interest, skirt, spare-time activity, staples, stock, stock-in-trade, store, stow, table, table the motion, vendibles, verge, wares
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