flea market (n.)youdaoicibaDictYouDict[flea market 词源字典]
1917, especially in reference to the marché aux puces in Paris, so-called "because there are so many second-hand articles sold of all kinds that they are believed to gather fleas." [E.S. Dougherty, "In Europe," 1922].[flea market etymology, flea market origin, 英语词源]