to start to be successful again after a difficult period, for example after experiencing failure, loss of confidence, illness, or unhappiness

Stock prices bounced back after a steep plunge earlier this week. 股票价格在本周早些时候急剧下跌后又回弹了。

Children often seem to bounce back from illness more quickly than adults do. 孩子通常比成人病后恢复得更快。