The ball is in your court means it is up to you to make the next move. It is time for someone to deal with a problem or make a decision because other people have already done as much as they can.

For example:

I’ve done all I can; now the ball’s in your court.

I’ve done my bit. The ball’s in his court now.

I’ve helped him in every way I can — the ball’s in his court now.

We’ve made him an offer, but now he has to decide whether to accept: the ball is in his court.

In every negotiation, the time comes when the other side puts an offer on the table. At that point, the ball is in your court.

Tradução: a responsabilidade é com você agora, agora é com você, aguardo a sua contraproposta, você é quem sabe, agora é a sua vez .