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

1.
神圣不可侵犯的事物, 禁忌
a person, idea, or institution that is considered to be above criticism or attack, often unreasonably so
:
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The company's old policies have become sacred cows that no one dares to question.
公司的旧政策已经成为无人敢质疑的神圣不可侵犯的事物。
•
For many, the national health service is a sacred cow that should not be privatized.
对许多人来说,国家医疗服务是不可侵犯的神圣事物,不应私有化。