(plural side walls)
side + wall, because it each of the walls in question is located on a side of the court.
"side-wall." YourDictionary, n.d. Web. 20 January 2019. <https://www.yourdictionary.com/side-wall>.
side-wall. (n.d.). Retrieved January 20th, 2019, from https://www.yourdictionary.com/side-wall
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