The ball is in your court

 The ball is in your court.

This idiom means it is your turn to speak or do something.  Read the dialog below to get a good example of how to use this expression.

Fred – So, did you do it?

Nat – Do what?

Fred – You know…

Nat – No, I don’t know.

Fred – Did you ask Carol if she likes me?

Nat – Oh, yeah, I did ask.

Fred – And?

Nat – She said she does.  Now the ball is in your court.

Fred – I guess you are right.  I’ll wait for her to ask me out.

Nat – No silly!  You need to ask her out!