An upswing is a sudden improvement in something such as an economy, or an increase in an amount or level.
例句
...an upswing in the economy...经济的迅速回升Violent crime is on the upswing.暴力犯罪率正在攀升。
英汉词典释义
n.
进步,改进,提高,上升
Shocking crimes are now on the upswing.骇人的罪行正在增长。The economy is in the upswing which makes high tech services in more demand too.经济在蓬勃发展,这就使对高科技服务的需求量也在加大。