The term 'supersede and replace' is a phrase used to describe the process of replacing an existing item with a newer, more advanced version. The crossword solution for this phrase is 'SUPPLANT, ' which means to take the place of something else. This term is often used in the context of technology, where a new product or service is released to replace an older one. It can also be used in other contexts, such as when a new law or policy is introduced to replace an existing one.