a cash cow

cash cow

A business or investment that generates a large or consistent profit. When Bob purchased stock in that software company 10 years ago, he never expected it to become such a cash cow. Now that it has quadrupled in value, he'll be able to retire early.
See also: cash, cow

a cash cow

If you call someone or something a cash cow, you mean that it makes a lot of money. This rather unglamorous property is a cash cow, generating about $700 million a year in advertising revenue. A player like Rooney is a potential cash cow to dozens. Note: The reference is to something that produces money as freely as a cow produces milk.
See also: cash, cow
References in periodicals archive ?
And that's supremely important because, as we've already proven, machining is not going to be a cash cow.
It's a lousy business unless, of course, you have a cash cow metalcasting business that is so lucrative you'll invest in a marginal business to protect it.
The county Metropolitan Transportation Authority uses the San Fernando Valley like a cash cow but doesn't invest enough to keep the cow alive.