Main Entry: ¹side·line

Pronunciation: \-ˌlīn\

Function: noun

Date: circa 1862

1 : a line at right angles to a goal line or end line and marking a side of a court or field of play for athletic games
2 a : a line of goods sold in addition to one's principal line b : a business or activity pursued in addition to one's regular occupation
3 a : the space immediately outside the lines along either side of an athletic field or court b : a sphere of little or no participation or activity —usually used in plural