blue-board
n.— «Travelers along Interstate 57 are subjected to food, fuel and lodging signage, along with tourist attractions. Following years of paperwork and waiting, signs are being installed at the Exit 71 mile marker, also known as the Benton-Christopher exit, that will feature some of the best the area has to offer. “We originally applied for the attraction signs—or blue-boards as they are called—five years ago.”» —“Wheels of progress turning: Attraction signs on the horizon” by Mona Sandefur Benton Evening News (Illinois) Feb. 11, 2008. (source: Double-Tongued Dictionary)
Further reading
When lexicographers look at linguistic corpora, they find that the color name hazel is most often followed by the word brown. The descriptive term hazel blue, as in hazel blue eyes, is rarely used. If you ever get tired of using the word hazel, you...
Ian in Clyde, North Carolina, is puzzled when a colleague uses the term blue million, meaning “a large amount.” Along with words like zillion and gazillion, this expression functions as an indefinite hyperbolic numeral. Sometimes the word blue...