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Phrase(s): A fool and his money are soon parted.
Prov. Foolish people spend money, without thinking. (Perceived as a rebuke if you say it about the person you are addressing.) • Go ahead and buy a diamond collar for your dog if you really want to. A fool and his money are soon parted. • Bill sends a check to every organization that asks him for money. A fool and his money are soon parted.
McGrawhill's American Idioms And Phrasal Verbs