What is a bad penny?

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Noun. bad penny (plural bad pennies) Used other than figuratively or idiomatically: see bad,‎ penny: A counterfeit or damaged penny. (idiomatic) A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times..
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Porcini are sold fresh in markets in summer and autumn in Central and Southern Europe, and dried or canned at other times of the year, and distributed worldwide to countries where they are not otherwise found. They are eaten and enjoyed raw, sautéed with butter, ground into pasta, in soups, and in many other dishes..
Noun. bad penny (plural bad pennies) Used other than figuratively or idiomatically: see bad,‎ penny: A counterfeit or damaged penny. (idiomatic) A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times..