A consolidated city-county is when a big city and a county decide to join together and become one big government. It's like when you and your best friend decide to join forces and become a super duo.
When a city and county join together, it can save money because they won't need to have separate governments anymore. It also means that everyone who lives in the city-county will have the same rules and laws, so it's easier to understand what you can and can't do.
For example, if you live in a regular city, you might have different rules for your neighborhood than your friend who lives in the county. But if your city and county join together, everyone will have the same rules, which can be really helpful.
Overall, a consolidated city-county is when a big city and a county become friends and work together to make things easier and more efficient.