SIDELINE

I. noun Date: circa 1862 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 line of goods sold in addition to one's principal line, a business or activity pursued in addition to one's regular occupation, 3. the space immediately outside the lines along either side of an athletic field or court, a sphere of little or no participation or activity, II. transitive verb Date: 1943 to put out of action ; put on the ~s