pushmi-pullyu (n.)youdaoicibaDictYouDict[pushmi-pullyu 词源字典]
fictional two-headed mammal, from "Dr. Dolittle" (1922), coined by Hugh Lofting from the expressions push me, pull you. Popularized by the 1967 film version of the book.[pushmi-pullyu etymology, pushmi-pullyu origin, 英语词源]