养虎伤身的意思

[bringing up a tiger one sustains injury himself——to be injured by one whom one has been kind to] 饲养老虎,伤及自身。比喻纵容坏人,害了自己。

饲养老虎，自伤其身。比喻纵敌留患。明·沈采《千金记·入关》：“大王，你只宜乘早击之，若迟便有养虎伤身之害矣。”