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Phrase(s): How the mighty have fallen.
Prov. a jovial or mocking way of remarking that someone is doing something that he or she used to consider very demeaning. • Jill: Ever since Fred’s wife left him, he has had to cook his own meals. Jane: Well! How the mighty have fallen! • When Dan lost his money, he had to sell his expensive sports car. Now he drives an ugly old sedan. How the mighty have fallen.
McGrawhill's American Idioms And Phrasal Verbs