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60页(205字)
用做窃贼的代称,有时也比喻脱离实际的人,例昨夜不慎未锁前门,使梁上君子乘机而入,幸亏损失不大。
Last night I was careless and did not lock the front door.A thief got in but fortunately not much was lost.