in play/out of playDSif a ball is in play or out of play, it is inside or outside the area in which the rules of the game allow you to hit, kick, catch etc the ball 〔球〕在界内/界外 He kicked the ball out of play. 他把球踢出界外。
in play/out of play• Courier put only 50 percent of his first serves in play.
→ in play/out of play at play2(1)