the ball is in someone's court

• have the ball in one's court

From tennis, as when the ball is in someone's court it is their turn to play.

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the ball is in someone's court

1. (idiomatic) It is someone's turn to do something; often making a decision.

   Well there's not much more I can do, so the ball is in your court now.

   • 2017 October 9, Theresa May, 1:05 from the start, in Theresa May's Brexit speech‎, via The Guardian:

     Achieving that partnership will require leadership and flexibility. Not just from us, but from our friends, the 27 nations of the EU. And as we look forward to the next stage, the ball is in their court, but I am optimistic it will receive a positive response.