rat
n.— «The Senate passed it only after Democratic leaders agreed to repeal the special favor for Pawelkiewicz—known in legislative parlance as a “rat”—in a separate bill at a future date.» —“Lawmakers OK Borrowing Boost” by Mark Pazniokas Hartford Courant (Conn.) May 12, 2004. (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...