◎家賊難防jiāzéi-nánfáng
[thief in the family is difficult to detect; a thief from within is hard to guard against;it is difficult to forestall a thief within the house] 家屬或內部的人作弊營(yíng)私難以防范
⒈ 家庭內部的賊人或內奸最難防范。
引《五燈會(huì )元·同安志禪師法嗣·梁山緣觀(guān)禪師》：“問(wèn)：‘家賊難防時(shí)如何？’師曰：‘識得不為寃?！?br/>清李漁《凰求鳳·悟奸》：“這等看起來(lái)，真箇是家賊難防，連星相醫卜的話(huà)都是他教導的了？”
比喻內部的敵人或壞人最難防范。