a line at each end of a court or playing field at right angles to the sidelines that defines one of the lengthwise boundaries of the playing area.
a line at each end of a football field parallel to and 10 yards (9 meters) behind the goal line.
Origin of end line
An Americanism dating back to 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019