McGuffinMcGuffin◙ noun 1. an object or device in a film or a book which serves merely as a trigger for the plot • （电影或小说中触发故事情节的）麦加芬母题
【语源】
1. late 20th cent.: a Scottish surname, said to have been borrowed by the English film director, Alfred Hitchcock, from a humorous story involving such a pivotal factor