So I have this great book “Word and Phrase Origins” by Robert Hendrickson, that I look at nearly everyday. Undoubtedly, I or someone will say some figure of speech or expression and I’ll want to look up. Today at breakfast, for example, a woman sitting behind us was talking about her sons lack of a “nest egg.” (Listen lady, he’s not alone!)
From the book: Nest egg…”People saved nest eggs as early as the 17th century. The expression relates to the pottery eggs once put in hens’ nests to induce the hens to lay their own eggs. Persons who start saving a nest egg put a little money (like a porcelain egg) aside, which encourages them to save more. Maybe that woman needs to put some monopoly money into her son’s savings account.