Comprehensive resource for understanding and mastering English idioms
The idiom "the ball is in your court" means that it is now someone's turn to take action or make a decision, especially in a situation where there has been a pause or delay. It implies that the responsibility for moving things forward lies with the person who has possession of the ball, metaphorically speaking.
The origin of this idiom is not clear, but it has been used since at least the early 20th century. One theory suggests that the phrase comes from the game of tennis, where the player who hits the ball last has the opportunity to serve or make a return. Another theory suggests that the phrase comes from the sport of golf, where the player who hits the ball closest to the hole has the chance to put it in and win the round. Over time, the idiom has been used in various contexts and has become a common expression for when it is someone's turn to take action or make a decision.