Trace back is a term used to describe the process of finding the origin of something. It can be used to REFER to the origin of a person, an idea, or a product. The crossword solution for trace back is 'REFER'. Referring to something means to look back to its source or origin. This can be done by researching, asking questions, or looking at records. Trace back is a useful tool for understanding the history of something and can help to provide insight into its current state.