[no passive] (usually used in the progressive tenses 通常用于进行时) (informal) to support or encourage sb in a sports competition or when they are in a difficult situation （体育比赛或遭遇困难时）给…助威，给…加油
We’re rooting for the Bulls.
我们为公牛队加油。
Good luck—I’m rooting for you!
祝你好运，我支持你！