nest egg index
n.— «This “nest egg index,” as it was called, was conducted by A.G. Edwards, a St. Louis-based financial services company. It looked at money-saving data from 318 cities.» —“West Side or East: The battle of the savers” by Alan Julian Evansville Business Journal (Illinois) Dec. 18, 2005. (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...