a sacred cow
an idea, custom or institution held, especially unreasonably, to be above questioning or criticism
Sacred cow originally referred to the veneration of the cow as a sacred animal in the Hindu religion.
1991 - Here's Health - The British diet remains a sacred cow.
Related Idioms :
have a cow
become angry, excited or agitated - North American informal
1990 - Susin Nielsen – Wheels- 'Don't have a cow,' she said huffily. 'It's no big deal.'
till the cows come home
for an indefinitely long time - informal
a sacred cow :
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