rank outsider
noun [ C ] uk/ˈræŋk aʊtˌsaɪ.dər/ us/ˈræŋk aʊtˌsaɪ.dɚ/
不被看好的比赛者;不大可能获胜的选手
someone who is not expected to win a race or competition
He came from nowhere, this rank outsider, to beat a field of top-class athletes. 他这个谁都没有看上眼的选手一下子冒了出来，竟然击败了赛场上所有的顶尖运动员。