Redshirt is a term that originated from sports, specifically in American football, where a player wears a red-colored shirt signifying that he or she is a non-participating member of the team. However, it is now commonly used in other areas such as entertainment and literature. If you're tired of using redshirt repeatedly, there are several alternative words you can use, including non-playing member, inactive player, reserve, benchwarmer, substitute, stand-in, understudy, and backup. These synonyms are applicable in different contexts and can help add variety to your writing or conversation. Whether it's for a sports team or a television show, using these synonyms can help you avoid redundancy and keep your conversation or writing fresh.