to make a horse go more slowly or stop by pulling on its reins

to control an emotion, activity, or situation to prevent it from becoming too powerful

We tried to rein in our excitement and curiosity. 我们尽力克制住兴奋和好奇。

Reports today suggest consumers are already reining back spending. 今天发表的调查报告显示，消费者已经开始控制花销。