Sacred cow

The phrase "sacred cow" is often used metaphorically to refer to a belief, institution, or tradition that is thought to be immune from criticism or change, despite its apparent flaws or outdated nature. It originated from the veneration of cows in certain cultures, particularly in Hinduism, where cows are considered sacred and are often protected from harm or slaughter. Similarly, a "sacred cow" in common usage refers to something that is considered untouchable or beyond reproach, often leading to resistance against any attempts to challenge or question its validity.