noun
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
- the areas just outside these lines
- a small line branching off the main line, as of a railroad, pipeline, etc.
- ☆ a line, as of merchandise or work, in addition to one's main line
transitive verb sidelined, sidelining
☆ to remove from active participation: sidelined by an injury