the ball is in someone’s court字面意思球在某人那边的球场上，引申为现在是轮到某人采取行动了；该你行动了；下一步就看你了。

【例句】
Now the ball is in my court. I have to decide whether I'm going to make the effort to get more serious about studying.
现在是轮到我来采取行动了。我必须决定是否要加紧努力，更认真地对待学习。

I’ve dropped enough hints to show how much I like him – the ball’s in his court now to make the next move.
我已经给出了足够的暗示，表明我有多么喜欢他，下一步怎么做就看他的了。