catch on
钩住，卡住；绊住：
She caught her foot on the threshold and stumbled.
她的一只脚被门槛绊住而跌倒了。
2. 理解，明白；熟悉情况(常与to连用):
Please repeat what you said, I didn't quite catch on.
请把你的话再说一遍，我没十分听明白。
You'll catch on to the job after you've been here a while.
过一段时间你就会熟悉这种工作了。
3. 变得入时，流行起来；迎合人心：
This song caught on and was sung everywhere.
这首歌曲流行起来，各地都在演唱。
