Something nobody is allowed to question or change.
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Something people refuse to question, even when it no longer works.
A sacred cow is protected by habit and feeling, so suggesting a change upsets people.
The phrase comes from the sacred status of cows in India.
"A Hornet's Nest"
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A situation that causes trouble if disturbed
"Set in Stone"
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Fixed and impossible to change
"A Sacred Cow"
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Protected from any question by tradition