弄假成真
    Pinyin: nòng jiǎ chéng zhēn

    Usage: 兼语式;作谓语、宾语;指将假的变成真的

    Explanation: 本来是假装的,结果却弄成了真的。

    Source: 宋·邵雍《弄笔吟》:“弄假像真终是假,将勤补拙总输勤。”

    Example: 那一个掌亲的,怎知道~。(元·无名氏《隔江斗智》第二折)

    Postscript: 甘露寺招亲

  • Thesaurus:  to do something seriously after starting it as a joke, ruse, etc., preterce(pretending) may become reality(truth)