primary
v.— «Most lawmakers represent safe districts, giving them little incentive to tack to the center and work together. Indeed, many incumbents worry more about “being primaried,” as they put it, drawing a primary challenge from within their own parties for being insufficiently orthodox.» —“Tom Davis Gives Up” by Peter Baker New York Times Oct. 5, 2008. (source: Double-Tongued Dictionary)
Further reading
A discussion on the English Language & Usage Stack Exchange about things that can still be useful even if they longer function properly, such as escalators and moving sidewalks, included several intriguing expressions involving partial failure...
If everyone on the planet spoke a single language, wouldn’t that make life a whole lot easier? For that matter, is a common world language even possible? Maybe for a minute or so—until new words and phrases start springing up. Also, did you ever...