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

1.
üçüncü ray, hassas konu
a political issue that is so controversial that any politician who dares to broach the topic will suffer a backlash from voters
:
•
Healthcare reform has become a third rail issue in American politics.
Sağlık reformu Amerikan siyasetinde bir üçüncü ray meselesi haline geldi.
•
No politician wants to touch the third rail of social security.
Hiçbir siyasetçi sosyal güvenliğin üçüncü rayına dokunmak istemez.