a sacred cow

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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