a game of bouncing a ball off any part of your body except your hand or arm, as many times as you can without the ball hitting the ground

Let's play keepy-uppy. 我们来玩颠足球吧。

a movement in which you bounce a ball off any part of your body except your hand or arm, in order to prevent it from hitting the ground

He was practising his keepie-uppies. 他在练习颠球。