ghost
n.— «“Ghosts” is a term used to describe non-roster invitees to Major League Baseball spring training.» —“Ghosts trying to scare up roster spots” by Mike Cunniff Morris Daily Herald (Illinois) Feb. 24, 2006. (source: Double-Tongued Dictionary)
Further reading
After our chat about tongue twisters, a Chicago, Illinois, listener shares one that looks much easier than it sounds: Irish wristwatch. This is part of a complete episode.
Related
Michael from Jones, Michigan, says he was stationed on a U.S. Army base in Germany in the early 1960s. If there was a gust of cold wind, a fellow soldier would say the hawk’s out. This expression is largely associated with Chicago, Illinois...