sideline
noun(side-line)
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
sideline
noun(side-line)
a line of goods sold in addition to one's principal line
sideline
noun(side-line)
a business or activity pursued in addition to one's regular occupation
sideline
verb(side-line)
to put out of action : put on the sidelines