blue helmet
n.— «Video footage seen by The Independent shows the bodies of many killed in the capital, Port-au-Prince, and contains testimony from witnesses claiming the victims were killed by “blue helmets”—common parlance for UN peacekeepers.» —“Peacekeepers accused after killings in Haiti” by Andrew Buncombe in Washington, D.C. Independen (U.K.) July 29, 2005. (source: Double-Tongued Dictionary)
Further reading
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...
Have you ever googled your own name and found someone else who goes by the very same moniker? There’s a word for that: googleganger. Plus, the language of hobbyists and enthusiasts: If you’re a beekeeper, perhaps you call yourself a...