The phrase "upper hand" means having an advantage or being in a position of power over someone else. It can refer to having control, influence, or authority in a situation, often due to knowledge, skill, or resources that give one person an edge over others. The term is commonly used in various contexts such as politics, business, relationships and sports, where it signifies the ability to make decisions, set agendas, and determine outcomes based on one's advantageous position.