A wall that forms the side of something.
A side surface of an automobile tire, between the edge of the tread and the wheel rim.
The side of a tire between the tread and the bead.
If the puncture had been in the tread I could have had the tire patched, but it was in the sidewall and they can't fix that: they have to replace the whole tire.
The wall forming the side of a structure.
- The wall forming the side of a racquetball court.
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