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English definition of “be like a red rag to a bull”

be like a red rag to a bull

mainly UK
to be certain to produce an angry or violent reaction: Don't tell him you're a vegetarian - it's like a red rag to a bull.Causing feelings of anger and displeasure
(Definition of be like a red rag to a bull from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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