Ball is in his court
轮到他了，现在由他来做决定或采取下一步行动。
用于描述某人需承担决策或行动责任。
英文释义
It is up to him to make the next step.
例句
We've sent the proposal; the ball is in his court now.
典故来源
源自网球术语，球在对方场地时需对方回击，引申为责任转移。