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

1.
rel ketiga, isu sensitif
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.
Reformasi layanan kesehatan telah menjadi isu rel ketiga dalam politik Amerika.
•
No politician wants to touch the third rail of social security.
Tidak ada politisi yang ingin menyentuh rel ketiga jaminan sosial.