a piece of exercise equipment like a small trampoline (= a frame with strong material stretched across it, for jumping up and down on)

You can lose fat and tone muscles doing twists and jumping jacks on a rebounder. 你可以通过在跳床上转体、跳跃来减肥和锻炼肌肉。

a basketball player who often gets the ball after shots (= attempts to score points) have been missed

He was fierce on defence and an excellent rebounder. 他在后防线上很厉害，抢夺篮板也很出色。

He was the Hoosiers' leading scorer and rebounder each season. 他是球队每个赛季的得分王和篮板王。