blue canary
n.— «Altschul said that the first responders to any terrorist attack would likely be police or firefighters. Like the canaries once used by miners to detect poisonous methane gas, the “blue canaries,” as police and firefighters are sometimes called, would probably suffer heavy casualties until the agent is identified.» —“Army giving cities fighting chance against chemical weapons attack” by Ron Martz Atlanta Journal-Constitution (Georgia) June 29, 1997. (source: Double-Tongued Dictionary)
Further reading
Joan from Augusta, Georgia, says her grandfather used to pronounce the word onions as if they were spelled ernions. The word onion is adapted from the French cognate oignon, and thanks to variations in dialect, geography, and other factors, this...
Penny in Savannah, Georgia, recalls that her father, a Navy veteran who served in the South Pacific, would say of someone who was clueless or didn’t know what he was talking about: That person doesn’t know if he’s punched, bored...