The term "backstretch," in horse racing, refers to the straight section of the track opposite the grandstand. Antonyms for this word could include "homestretch," which is the final straight section before the finish line, and "turn," which refers to the curved sections of the track used for turning. Other antonyms for "backstretch" could include "starting gate," where the horses are lined up before the race begins, and "paddock," where the horses are prepared for the race and can be viewed by spectators. Finally, "winner's circle" could be another antonym, as it is the area where the winning horse and jockey are celebrated after the race.