The meaning of A RED RAG TO A BULL is —used of something that makes a person very angry. How to use a red rag to a bull in a sentence.
2. To torment with persistent insult or ridicule: bait, bullyrag, heckle, hector, hound, taunt. Informal: needle, ride. Idiom: wave the red flag in front of the bull. The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Publ...