noun
A person who is able to bring in a large amount of money or business, often through their influence or connections
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The rainmaker was able to successfully bring rain to the drought-stricken region.
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They say John is a real rainmaker when it comes to closing deals.
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That guy is a total rainmaker - he can make anything happen!
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In the world of finance, she was known as the rainmaker for her ability to bring in big clients.