laughing-stock (n.)youdaoicibaDictYouDict[laughing-stock 词源字典]
also laughingstock; 1510s, formed by analogy with whipping-stock "whipping post," later also "object of frequent whipping" (but that word is not attested in writing in this sense until 1670s). See laughing + stock (n.1). Compare gaping-stock "person or thing regarded as an object of wonder."[laughing-stock etymology, laughing-stock origin, 英语词源]