It is your turn to take action or make a decision. The responsibility for the next move lies with you.
This phrase originates from tennis, where the ball being in your court means it's your turn to hit it back. The metaphor transferred from sports to general conversation in the mid-20th century, as tennis became more widely understood and played.
What makes this phrase brilliant is how perfectly the tennis metaphor captures the back-and-forth nature of decision-making and responsibility. Unlike many sports metaphors that feel forced, this one feels so natural that people often use it without realizing they're making a tennis reference.
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