third rail
US /ˌθɜːrd ˈreɪl/
UK /ˌθɜːrd ˈreɪl/

1.
derde rail, gevoelig onderwerp
a political issue that is so controversial that any politician who dares to broach the topic will suffer a backlash from voters
:
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Healthcare reform has become a third rail issue in American politics.
Hervorming van de gezondheidszorg is een derde rail kwestie geworden in de Amerikaanse politiek.
•
No politician wants to touch the third rail of social security.
Geen enkele politicus wil de derde rail van sociale zekerheid aanraken.