Definition of milch cow noun from the Oxford Advanced Learner's Dictionary

 

milch cow

 noun
noun
BrE BrE//ˈmɪltʃ kaʊ//
 
; NAmE NAmE//ˈmɪltʃ kaʊ//
 
(British English)
 
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a person, an organization or a product from which it is easy to make money The region is treated as a milch cow by central government.