a line at or along the side; specif.,
- either of two lines marking the side limits of a playing area, as in football or tennis
- [pl.] the areas just outside these lines
- a line, as of merchandise or work, in addition to one's main line
transitive verb-·lined·, -·lin·ing
to remove from active participation: sidelined by an injury
on the sidelines
- in the area along the sidelines
- outside the main sphere of action
- not actively participating
- Sports a. A line along either of the two sides of a playing court or field, marking its limits.b. sidelines The space outside such limits, occupied by coaches, inactive players, and spectators.
- sidelines The position or point of view of those who observe rather than participate in an activity: the political sidelines.
- A subsidiary line of merchandise.
- An activity pursued in addition to one's regular occupation.
transitive verbside·lined, side·lin·ing, side·lines
To remove or keep from active participation.
- A line at the side of something, as in "the yellow sideline of the road".
- (sports) A line defining the side boundary of a playing field.
- (usually in the plural) The area outside the playing field beyond each sideline.
- The coach stood on the sidelines and bellowed commands at the team.
- The outside or perimeter of any activity.
- She installed the whole fixture while he simply watched from the sidelines.
- Something that is additional or extra or that exists around the edges or margins of a main item.
- She started the business as a sideline to her regular work and it ended up becoming the greater source of income.
- Soup need not be just a sideline to a meal; if you like, it can be the main course.
(third-person singular simple present sidelines, present participle sidelining, simple past and past participle sidelined)