yard dog
n.— «The yard dogs—prison vernacular for guards—were already baying. Someone had issued a Signal 3, a man-down alert, and guards descended from all directions.» —“Gang life at prison on trial in murder case” by Ted Wendling Plain Dealer (Cleveland, Ohio) Feb. 27, 2005. (source: Double-Tongued Dictionary)
Further reading
It was a dark and stormy night. So begins the long and increasingly convoluted prose of Edwards Bulwer-Lytton’s best-known novel. Today the annual Bulwer-Lytton Contest asks contestants for fanciful first sentences that are similarly...
We use the term Milky Way for that glowing arc across the sky. But how people picture it varies from culture to culture. In Sweden, that starry band goes by a name that means “Winter Street,” and in Hawaii, a term for the Milky Way...