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In Hinduism, the cow is revered as the source of food and symbol of life and may never be killed. However, many non-Hindus interpret these beliefs to mean that Hindus worship cows. This is not true. It is more accurate to say the cow is taboo in the Hindu religion, rather than sacred.
Look up sacred cow in Wiktionary, the free dictionary. Sacred cow is an idiom, a figurative reference to sacred cows in some religions. This idiom is thought to originate in American English, although similar or even identical idioms occur in many other languages.he idiom is based on the popular understanding of the elevated place of cows in Hinduism and appears to have emerged in America in the late 19th century. A literal sacred cow or sacred bull is an actual cow or bull that is treated with sincere reverence.