Definition of sacred cow noun from the Oxford Advanced Learner's Dictionary


sacred cow

BrE BrE//ˌseɪkrɪd ˈkaʊ//
; NAmE NAmE//ˌseɪkrɪd ˈkaʊ//
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a custom, system, etc. that has existed for a long time and that many people think should not be questioned or criticized the sacred cow of free market economics
See the Oxford Advanced American Dictionary entry: sacred cow