毒を以て毒を制す どくをもってどくをせいす fight fire with fire; set a thief to catch a thief; fight one evil with another exp id Advanced ➥
他山の石以て玉を攻むべし たざんのいしもってたまをおさむべし one should learn from other's mistakes; stones from other mountains can be used to polish one's own gems exp proverb Advanced ➥