side-line

sideline

[sahyd-lahyn]
noun
1.
a line at the side of something.
2.
a business or activity pursued in addition to one's primary business; a second occupation.
3.
an additional or auxiliary line of goods: a grocery store with a sideline of household furnishings.
4.
Sports.
a.
either of the two lines defining the side boundaries of a field or court.
b.
sidelines, the area immediately beyond either sideline, where the substitute players sit.
5.
sidelines, the position or point of view taken by a person who observes an activity or situation but does not directly participate in it.
verb (used with object), sidelined, sidelining.
6.
to render incapable of participation, especially in anything involving vigorous, physical action, as a sport: An injury to his throwing arm sidelined the quarterback for two weeks.

Origin:
1685–95, Americanism; side1 + line1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sideline (ˈsaɪdˌlaɪn)
 
n
1.  sport a line that marks the side boundary of a playing area
2.  a subsidiary interest or source of income
3.  an auxiliary business activity or line of merchandise
 
vb
4.  to prevent (a player) from taking part in a game
5.  to prevent (a person) from pursuing a particular activity, operation, career, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

sideline
"lines marking the limits of playing area" (on a football field, etc.), 1862, from side (adj.) + line (q.v.). The fig. sense of "position removed from active participation" is attested from 1934 (because players who are not in the game stand along
the sidelines). The verb meaning "put out of play" is from 1945.
Online Etymology Dictionary, © 2010 Douglas Harper
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