This term is commonly used in horse racing, where horses are categorized based on their performance and the level of competition. When a horse drops in class, it is moving to a race with less competitive runners, which can increase its chances of winning. This strategy is often employed by trainers to help a horse regain form or to take advantage of a more favorable field.
Drop in Class/Trip Example
For example, if a horse has been racing in stakes races (high-level competitions) but has struggled to finish well, the trainer might enter it in a claiming race (lower-level competition) to give it a better chance of success.