Side-wall meaning

Used other than as an idiom: see side,‎ wall.
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Either of the two parallel walls in a racquetball or squash court, perpendicular to the front wall; either of the walls on the side of the court.
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Origin of side-wall

  • side +‎ wall, because it each of the walls in question is located on a side of the court.
    From Wiktionary