Reverse hierarchy means that instead of people in higher positions having power over people in lower positions, people in lower positions have more power than people in higher positions. This is different from a traditional hierarchy, where the people at the top are in charge. In a reverse hierarchy, everyone works together to make decisions and get things done. For example, in a school, a reverse hierarchy might mean that students work with teachers and other staff to set the rules and make decisions about what the school should do.