To express in writing or speech a prolonged series of violently angry and resentful complaints or criticisms at or to someone or something, especially when they are or are believed to be responsible. Sarah keeps ranting at me about the state of the apartment, but I told her that I always clean up after myself. I work in IT, so I've always got people from all over the company ranting at me about some technical issue or another. Ranting at the sky will do nothing to solve your problems.