be like a red rag to a bull Meaning in the Cambridge English Dictionary
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Meaning of “be like a red rag to a bull” in the English Dictionary

"be like a red rag to a bull" in British English

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be like a red rag to a bull

mainly UK to be ​certain to ​produce an ​angry or ​violentreaction: Don't ​tell him you're a ​vegetarian - it's like a red ​rag to a ​bull.
(Definition of be like a red rag to a bull from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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