Cut over is a term used to describe a process or event where a new system, project or process is implemented while relinquishing the old one. Synonyms for this term that can be used interchangeably are migration, transition, switch, crossover, handover, and upgrade. Migration means to move data or software from one system to another. Transition means moving from one state to another smoothly. Switch implies changing from one thing to another, and Crossover refers to moving from an old way of doing things to a new one. Handover means taking over from where someone else left off, while the upgrade denotes moving to a superior or improved system.