green air
n.— «The days ahead appear to offer more of the same “green air”—the term is derived from the green color code that denotes clean air—that settled into the region following the passage of Friday’s cold front.» —“Air quality improving” by Thomas Fraser Daily Times (Maryville, Tenn.) Sept. 17, 2005. (source: Double-Tongued Dictionary)
Further reading
There was a time when William Shakespeare was just another little seven-year-old in school. Classes in his day were demanding — and all in Latin. A new book argues that this rigorous curriculum actually nurtured the creativity that later flourished...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...