Someone who generates income or success for an organization, or historically, a person claiming to produce rain through magic or technology.
From 'rain' + 'maker.' The magical sense comes from Native American traditions and 19th-century charlatans; the business sense developed in the 20th century.
In business, a 'rainmaker' is someone so valuable they're worth keeping even if they break rules—but the original rainmakers were charlatans who charged money to make rain!
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