養ㄧㄤˇ虎ㄏㄨˇ遺ㄧˊ患ㄏㄨㄢˋyǎnghǔ‑yíhuàn

简养虎遗患

  1. 比喻縱容壞人，留下後患。也作「養虎貽患」。例 「除惡務盡，否則養虎遺患，後果堪憂」。

英Rear a tiger and court disaster. (idiom)​; fig. if you're too lenient with sb, he will damage you later, to cherish a snake in one's bosom