sacred cow
US /ˈseɪ.krəd kaʊ/
UK /ˈseɪ.krəd kaʊ/

1.
vaca sagrada, tema intocable
a person, idea, or institution that is considered to be above criticism or attack, often unreasonably so
:
•
The company's old policies have become sacred cows that no one dares to question.
Las viejas políticas de la empresa se han convertido en vacas sagradas que nadie se atreve a cuestionar.
•
For many, the national health service is a sacred cow that should not be privatized.
Para muchos, el servicio nacional de salud es una vaca sagrada que no debería privatizarse.