(feathered) oof-bird
obsolete Something that is a source of money, usually in large quantities. Don't you understand, Father? This crude oil will be our very own feathered oof-bird! Richard thinks this new invention of his will be his feathered oof-bird, but I'm skeptical, to tell you the truth. You better come up with a reliable way to earn money, instead hoping for some oof-bird to fall in your lap.
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