Roll back to zero is a term used to describe the process of resetting something to its original state. It is often used in computing and technology, where it refers to the process of restoring a system to its original settings or factory defaults. In other contexts, it can refer to the process of undoing changes that have been made to a system or process. The crossword solution for this term is 'RESET, ' which is a five-letter word meaning to set something back to its original state.