third rail

noun

1
: a metal rail through which electric current is led to the motors of an electric vehicle (such as a subway car)
2
: a controversial issue usually avoided by politicians

Examples of third rail in a Sentence

Social Security is the third rail of American politics.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
But cutting entitlements is also the third rail of American politics. Erin Doherty, Axios, 4 Dec. 2024 Failures of the overhead catenary wires — the power lines that function much like the third rail on a subway — have been a regular occurrence on the rail line in recent months. Evan Simko-Bednarski, New York Daily News, 2 Dec. 2024 Immigration has become a third rail in American politics, with lawmakers unwilling to tackle the basic problems plaguing our immigration system. Gary Shapiro, Fortune, 10 Oct. 2024 Yet reining them in has proved to be a political third rail. Gordon Adams, Foreign Affairs, 1 Jan. 2010 See all Example Sentences for third rail 

Word History

First Known Use

1867, in the meaning defined at sense 1

Time Traveler
The first known use of third rail was in 1867

Dictionary Entries Near third rail

Cite this Entry

“Third rail.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/third%20rail. Accessed 21 Dec. 2024.

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