The term "major player" is an idiomatic expression that refers to someone or something that holds significant influence, power, or importance within a particular field, industry, or situation. A major player can be a person who has a high level of authority, expertise, or impact in their area of interest; it could also refer to a company, organization, or institution that plays a leading role in shaping the course of events or decisions. In essence, being a "major player" means having an outsized effect on the outcome or direction of something due to one's position, resources, or abilities.