出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第95页（213字）
比喻有本领的人，平时不被觉察，一有机会表现其突出才能时，就使人为之一惊，例她第一次上台表演，一鸣惊人，连她的老师也大感意外。
Her name was made overnight after her very first performance．Even her teacher was taken by surprise．