BarmecideyoudaoicibaDictYouDict[Barmecide 词源字典]
"Illusory or imaginary and therefore disappointing", Early 18th century (as a noun): from Arabic Barmakī, the name of a prince in the Arabian Nights' Entertainments, who gave a beggar a feast consisting of ornate but empty dishes.[Barmecide etymology, Barmecide origin, 英语词源]