bringing up a tiger one sustains injury himself——to be injured by one whom one has been kind to
[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。”
?柞听了，大叫道：‘罢了，罢了！此乃养虎伤身也！’ ◎《说岳全传》第五七回