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25页（306字）
把老虎放回山去，是比喻将敌人放回去，以致留下祸根的意思，例昔日刘备为豫州牧时，某等请杀之，丞相不听；今又与之兵，此放龙入海，纵虎归山也。
When Liu Bei was governor of Yu Zhou，we recommended that he be put to death，but you would not hear of it．Today，you have given him an army．Aren’t you sowing seeds of danger for the future?