Adam Ruins Everything had a episode that covered this: https://www.youtube.com/watch?v=fu5XDrdD7KM https://www.youtube.com/watch?v=fu5XDrdD7KM In short: The di

Adam Ruins Everything had a episode that covered this: https://www.youtube.com/watch?v=fu5XDrdD7KM https://www.youtube.com/watch?v=fu5XDrdD7KM In short: The dictionary isn't the "law", it lags behind the language as it is actually used. Once the "reverse" definition of "literally" became common in usage it became the new definition - not what a dictionary used to define it as.