fight it out 争论，争辩，竞争；一决雌雄；一见高低；奋战到底

【例句】
Must fight it out with him 1 am no coward.
我一定要与他决一雌雄我可不是弄种。

They hadn't reached any agreement so we left them to fight it out.
他们还没有达成协议，所以我们让他们争出个结果。