merry-andrew (n.)youdaoicibaDictYouDict[merry-andrew 词源字典]
"a buffoon; a zany; a jack-pudding" [Johnson], originally "mountebank's assistant," 1670s, from merry + masc. proper name Andrew, but there is no certain identification with an individual.[merry-andrew etymology, merry-andrew origin, 英语词源]