fight to see who is the stronger; fight (/battle) it out; have a showdown;see which of the two can get the better of the other ❍ 当时的局面是双方都为～而准备着。The situation at that time was that both sides were making prepa rations for a showdown. ❍ 项王谓汉王曰： “……愿与汉王挑战决雌雄，毋徒苦天下之民父子为也！” (《史记·项羽本纪》) Xiang Yu made a proposal to the king of Han，“…Let us settle the issue now by hand-to-hand combat instead of involving all these other men.”
决一雌雄
fighting it out
决一雌雄jué yī cí xiónɡ
雌雄：原指动物的雌性和雄性，引申为胜负。判定胜败、高低。fight it out, wage a decisive battle, fight to the final, battle it out