grayshirt v. to not participate in a college sport (for a season) while still retaining elibigility. Editorial Note: A similar—but not identical—term is redshirt. The differences depend on the sport and the league, but this article (scroll about halfway down the page) and this one offer more detail. (source: Double-Tongued Dictionary)
Further reading
Why would some Spanish speakers use adaptations of certain English words when perfectly good Spanish words for the same thing already exist? Plus, handy terms in a dictionary of the Sussex dialect from 150 years ago: Back then, a dezzick was “a...
Jim in Columbia, South Carolina, has noticed sportscasters’ use of the phrase on the season with reference to a period of time. This construction shows up in the sports pages as early as the 1880s, first referring to a team’s revenue and...