单挑的英文翻译是 "duel" 或 "one-on-one confrontation". 这个词来源于法语的 "duellum"，意思是"决斗"。例句如下：

"The two champions faced off in a fierce duel for the championship title." (两位冠军在一场激烈的决斗中争夺冠军头衔。)

"The two politicians engaged in a heated one-on-one confrontation during the debate." (两名政客在辩论中进行了激烈的单挑。)