- informal a person, institution, custom, etc, unreasonably held to be beyond criticism
WordReference Random House Learner's Dictionary of American English © 2020
ˈsa•cred ˈcow, n. [countable]WordReference Random House Unabridged Dictionary of American English © 2020
someone or something thought to be important and therefore not to be criticized or questioned.
an individual, organization, institution, etc., considered to be exempt from criticism or questioning.
- in reference to the traditional inviolability of the cow among Hindus 1905–10
Collins Concise English Dictionary © HarperCollins Publishers::
sacred cow n