WordReference Random House Unabridged Dictionary of American English © 2019
cash cow′, [Informal.]
  1. Informal Termsany business venture, operation, or product that is a dependable source of income or profit.

Collins Concise English Dictionary © HarperCollins Publishers::

cash cow n
  1. a product, acquisition, etc, that produces a steady flow of cash, esp one with a well-known brand name commanding a high market share


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