battle (/fight) it out;decide (/see) who is the stronger; force (/call for)a showdown; have it out (with sb); wage a decisive fight (/battle)
❍ 他们将在下一次选拔赛中～。They will battle it out in the coming selected trial.
❍ 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》) Let’s settle the issue now by hand-to-hand combat instead of involving all these other men.
一决雌雄yī jué cí xiónɡ
雌雄：比喻胜负，高低。一决胜负、比出高低上下。fight it out, decide who is the stronger, have it out, fight a decisive battle