What does the idiom "the ball is in your court" mean?

Responsibility is yours. The ball is in your court means that the responsibility has passed to you, that the decision in a given situation is up to you, and that it is up to you to make the next move. When the ball is in your court, nothing else can happen in a given situation until you take action or make a decision. The idiom the ball is in your court is derived from the sport of tennis. When the ball bounces in your court during a game of tennis, you must take action and hit it to keep the game going. The expression the ball is in your court, expressed in a figurative sense, came into use in the 1960s.

Source: Grammarist