- (球)弹回，跳回：
When I kicked the football against the post, it bounced back.
我把足球往柱上踢去，它就弹了回来。
- (伤病后)复原，康复，恢复元气：
He was pretty ill with the flu, but he bounced back nicely.
他患重流感，但康复得很好。
- (失败或受打击后)很快恢复情绪，重新活跃，重新振作起来，卷土重来 (from):
After losing the first game of the double-header, our team bounced back to win the scond.
输掉一天连续两场棒球比赛的第一场后，我们队迅速恢复元气，赢了第二场比赛。
Although he was disappointed about not getting the job, Jack soon bounced back.
虽然杰克没找到工作很失望，但他很快就重新振作起来了。
- (经济等)好转，复苏，(价格下跌后)回升：
Share prices bounced back today.
股票价格今天回升了。
- [口语]对…有影响，产生效果，取得结果(on):
Whatever decision the president makes, it will bounce back on the future of the country.
不管总统会做出什么决定，它必将对国家的前途产生影响。
- (光、声音等)反射，折回：
to tell the nature of the object by the intensity of the sound bouncing back
据反射回来的声音强度辨别出物体