catch on

动词 catch on:

1. understand, usually after some initial difficulty
   同义词：get wise, get onto, tumble, latch on, cotton on, twig, get it
2. become popular

1. It is a nice song and I think it will catch on quickly.
   这首歌很好，我想它会很快流行起来。
2. He's always the last to catch on.
   他总是最后一个弄明白。
3. The catch on my handbag is broken.
   我的手提包的扣坏了。
4. I didn't catch on to this joke.
   我没明白这个笑话。