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190页（207字）
形容在众人面前出丑，例不懂装懂的人，常常在众人面前出乖露丑，弄得十分难堪。
It is very embarrassing when someone makes an ass of oneself by pretending to know something which one really does not．