blue canary
n.— «I’ve got to admit I was only a little surprised by the fact that the cops ran in the building without gear, common sense, etc. Have you ever seen cops approach the scene of a possible Haz-Mat incident? They’re not called “Blue Canaries” for nothing!» —“Re: COPS last saturday” by Harry Fell Usenet: misc.emerg-services Sept. 14, 1995. (source: Double-Tongued Dictionary)
Further reading
One of the most powerful words you’ll ever hear — and one of the most poignant — isn’t in dictionaries yet. But it probably will be one day. The word is endling, and it means “the last surviving member of a species.” The...
Ribbon fall. Gallery forest. You won’t find terms like these in most dictionaries, but they and hundreds like them are discussed by famous writers in the book Home Ground: A Guide to the American Landscape. The book is an intriguing collection...