/suyd"luyn'/ , n. , v. , sidelined, sidelining .
n.
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.
v.t.
5. to render incapable of participation, esp. in anything involving vigorous, physical action, as a sport: An injury to his throwing arm sidelined the quarterback for two weeks.
[ 1685-95, Amer.; SIDE 1 + LINE 1 ]