Meaning of the word "third rail" in English

What does "third rail" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

third rail

US /ˌθɜːrd ˈreɪl/
UK /ˌθɜːrd ˈreɪl/
"third rail" picture

Noun

1.

a political issue that is so controversial that any politician who dares to broach the topic will suffer a backlash from voters

Example:
Healthcare reform has become a third rail issue in American politics.
No politician wants to touch the third rail of social security.
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