As a Noun: 1. The very strong emotion that you feel when you think that someone has behaved in an unfair, cruel, or insulting way; extreme anger. English = fury, rage. As a Verb or Adjective: 1. To suddenly become extremely angry. Idiomatic English = blow one's top, blow up, hit the roof, fly off the handle. 2. To be extremely angry. English = furious. Formal English = incensed, enraged.