sidewall noun3 •The side of a tire.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; a side wall. •The wall forming the side of a racquetball court.The kill shot may also be used against balls weakly played off the sidewall — 1978 formssidewalls
