sacred cow

n.
One that is immune from criticism, often unreasonably so: "The need for widespread secrecy has become a sacred cow" (Bulletin of the Atomic Scientists).

[From the veneration of the cow by the Hindus.]

(SAY-krid kou)

noun
Something that is beyond criticism.

Etymology
From the special regard for a cow in the Hindu religion

Usage
"There are no sacred cows in the Philippine Army, Army chief Lt. Gen. Victor Ibrado claimed, as he vowed not to tolerate any unlawful acts of soldiers, whatever their rank or position may be." — Gilbert Bayoran; Army General Faces Court Martial; The Visayan Daily Star (Bacolod City, Philippines); Jul 28, 2008.

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A person or thing immune to criticism or questioning, as in The rules governing the press conference have become a sacred cow in this administration. This term alludes to the honored status of cows in Hinduism, where they are a symbol of God's generosity to humankind. It has been used figuratively since about 1900.

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