Definitions:

1. A person, idea, institution, or practice that is widely revered and treated as untouchable, often beyond reproach or reform. NOUN
   • Higher education is often treated as a sacred cow, despite growing debates about its cost.
2. Refers to something that is considered immune to criticism or questioning, often because it is highly respected, traditional, or culturally important, even if it may be outdated or problematic. NOUN
   • The pension system has become a sacred cow in politics- no one dares to propose changes.
3. Something that cannot be tempered with or criticized, for fear of public outcry. NOUN
   • The sacred cow concept is often used as a metaphor for untouchable or inviolable ideas or institutions.

Synonyms:

• idolized tradition
• sacred institution
• taboo topic
• untouchable idea