a red rag to a bull
idiom
British, informal
—used of something that makes a person very angry
Just mentioning his poor marks to him was like a red rag to a bull.
Cite this Entry
“A red rag to a bull.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/a%20red%20rag%20to%20a%20bull. Accessed 2 May. 2025.
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Merriam-Webster unabridged
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