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English definition of “cash cow”

cash cow

noun [C]    
FINANCE a business, product, or service that makes a large profit, often used to make money to support other business activities: Hong Kong Telecom has been a cash cow, thanks to a huge number of international calls.
MARKETING a product that has a large share of a market that is growing very little
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(Definition of cash cow noun from the Cambridge Business English Dictionary © Cambridge University Press)
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