yǎng hǔ shāng shēn
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。”
养虎伤身作谓语、定语;指自己害了自己。
bringing up a tiger one sustains injury himself (to be injured by one whom one has been kind to)