milch cow

UK: /ˈmɪltʃkaʊ/

WordReference Random House Unabridged Dictionary of American English © 2025

milch′ cow′. 

1. Animal Husbandry See milk cow. 

• late Middle English 1375–1425

WordReference Random House Unabridged Dictionary of American English © 2025

milch  (milch), adj. 

1. Animal Husbandry (of a domestic animal) yielding milk;
   kept or suitable for milk production.

• 1250–1300; Middle English milche; compare Old English -milce (in thrimilce the month of May, i.e., the month when cows could be milked thrice a day); see milk

Collins Concise English Dictionary © HarperCollins Publishers::

milch / mɪltʃ/ noun

1. (modifier) (esp of cattle) yielding milk
2. milch cow ⇒ a source of easy income, esp a person

Etymology: 13th Century: from Old English -milce (in compounds); related to Old English melcan to milk