cash cow

noun Informal.
any business venture, operation, or product that is a dependable source of income or profit.
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World English Dictionary
cash cow
 
n
a product, acquisition, etc, that produces a steady flow of cash, esp one with a well-known brand name commanding a high market share

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

cash cow

A dependable source of profit, as in The small-appliance division is this company's cash cow. Although this precise term dates only from about 1970, milch cow was used in exactly the same way from 1601.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Procedures are a cash cow for hospitals and specialists.
For those with the right connections, this has been a major cash cow.
Not, however, before some companies had consigned their electronics businesses
  to the fate of the cash cow.
He was a control freak, who created a proprietorial cash cow, while convincing
  his exploited customers that he was a saviour.
Synonyms
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