cash cow
Cash cow (noun) means a product, business unit or investment that reliably generates far more money than it costs to run, often used to fund riskier parts of a company. Example: “The printer ink division is the company's cash cow, quietly paying for everything else.”
How to use cash cow
Learner’s notesIn plain EnglishSomething that keeps making lots of money without much effort.
Informal but entirely acceptable in business writing and journalism.
The verb that goes with it is milk: companies milk a cash cow. Do not say feed a cash cow.
Trace the full origin ↓Fill the gap
Can you complete this real example?
The printer ink division is the company's _____, quietly paying for everything else.
Etymology
A figurative compound: a cow that can be milked continuously without further outlay, applied to a source of steady income.