subtext (n.)youdaoicibaDictYouDict[subtext 词源字典]
"underlying theme of a work of literature," 1950, from sub- + text (n.). Originally a term in Konstantin Stanislavsky's theory of acting. Earlier it was used in a literally sense of "text appearing below other text on a page" (1726). Latin subtextere meant "to weave under, work in below."[subtext etymology, subtext origin, 英语词源]