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276页（219字）
比喻言行前后矛盾，反复无常，例这种人出尔反尔，一点也不守信用，实在很难和他一起共事。
It is impossible to work with this person as he never keeps his promise and is in the habit of breaking his word all the time．