side wall
nounEtymology Because each of the walls in question is located on a side of the court.
1
Ball games, Games, Hobbies, Lifestyle, Sports, Squash Either of the two parallel walls in a court, perpendicular to the front wall; either of the walls on the side of the court.
2
Used other than figuratively or idiomatically: see side, wall.
- The milling action of the bucket line enables the trencher to cut through difficult materials, such as stone rubble and brick filling, and to leave a good trench with clean side walls.1956 January, “New Permanent Way Equipment on British Railways”, in Railway Magazine, page 57: