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.
When Does Summer Really End?So when the rest and relaxation is shooed away for cooler days and the start of school, it’s easy to forget that the summer season is far from over.
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