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English definition of “holy”

holy

adjective (FOR EMPHASIS)    /ˈhəʊ.li/ US  /ˈhoʊ-/
holy cow, mackerel, shit, etc.! mainly US informal used to show surprise, fear, etc.: Holy cow! How did you get that black eye?Taboo interjections
(Definition of holy adjective (FOR EMPHASIS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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