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be like a red rag to a bull

mainly UK

Definition

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 Learner's Dictionary & Thesaurus © Cambridge University Press)

“be like a red rag to a bull” in other dictionaries

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