catch up on sth补上某事;补做
catch catch on理解
catch be on fire失火
catch sb on sth我的袖子被钉子挂住了
catch something on film用相机拍下某物
catch you on Monday周一见
to catch up on赶上
catch h on wheel挡轮器
Catch It On Time准时赶上;把握时机;按时捕获
PHRASAL VERB（动词词组） If you catch on to something, you understand it, or realize that it is happening. 懂得; 领悟
He got what he could out of me before I caught on to the kind of person he'd turned into.
他尽其所能从我处得到一切后，我才明白他已蜕变成什么样的人。
PHRASAL VERB（动词词组） If something catches on, it becomes popular. 流行
The idea has been around for ages without catching on.
这个观点由来已久，但一直未风行。