milch cow

From Middle English melche cow, mylche cowe.

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milch cow (plural milch cows)

1. A cow kept for milking; a dairy cow.
2. A cow that produces milk (having had at least one calf).
3. (figurative) A cash cow.
4. (military, slang) A German WWII submarine designed to carry large cargoes of supplies and transfer them to other submarines.