milk cow
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noun
a cow that is raised for its milk rather than for beef.
Informal. a source of easily gained income; profitable venture: The new subsidiary turns out to be a real milk cow.
Origin of milk cow
late Middle English word dating back to 1400–50
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for milk cow
Historical Examples of milk cow
If it be a milk-cow, the lacteal secretion is diminished, and the udder is hot and tender.
The American Reformed Cattle DoctorGeorge Dadd
On his way he overtook a boy, a little fellow of eight or nine, driving a milk-cow ahead of him.
Under HandicapJackson Gregory
But one often reads of a milk-cow, so I supposed there must be some cows that are all for cream, if some are for milk.
Great Uncle Hoot-TootMrs. Molesworth