英语词汇cash cow的起源、历史背景-英语词源词典

词汇	cash cow
词源	cash cow. A generous source of money or income; any in- vestment, business operation, or product that pays well, pays steadily, and is dependable. Though cash cow is first recorded as a slang expression in the 1970s, the term milch cow, meaning the same, dates back to 1424, according to the OED. Weekley mentions the Anglo-Saxon thri-milce, “the month of May when cows can be milked three times a day.” Certainly a time when cows can be profitable. See may.
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