sideline

• POS: Noun, Verb (transitive)
• HYPHEN: side=line

CIDE DICTIONARY

sideline,  

•  A line pertaining or attached to the side of a thing.  [Webster 1913 Suppl.]
•  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.  [Webster 1913 Suppl.]

OXFORD DICTIONARY

sideline, n. & v.
--n.
1 work etc. done in addition to one's main activity.
2 (usu. in pl.) a a line bounding the side of a hockey-pitch, tennis-court, etc. b the space next to these where spectators etc. sit.
--v.tr. US remove (a player) from a team through injury, suspension, etc.

Idiom

on (or from) the sidelines in (or from) a position removed from the main action.

THESAURUS

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