catch on 是一个多义短语动词，核心含义包括“理解、领会”和“变得流行”。其英式音标为 /kætʃ ɒn/，美式音标为 /kætʃ ɑːn/。作为“理解”时，强调经过一段时间或困难后终于明白，常与介词 to 搭配接宾语；作为“流行”时，指事物逐渐被广泛接受或受欢迎。
理解，领会（尤指经过初始困难后）
表示对复杂或隐含信息的逐渐领悟，可单独使用或构成 catch on to sth 结构。
例：She didn't know what her classmates were plotting but finally caught on.
例：It took Cindy a long time to catch on to what Bill was saying.
同义词包括 get wise、tumble、cotton on 等。
变得流行，受欢迎
描述趋势、时尚或理念逐渐普及的过程，不用于被动语态。
例：Miniskirts first caught on in the 1960's.
例：The new song soon caught on among the youth.
与 prevail 的区别在于，catch on 更强调“逐渐流行”的动态过程。
catch on to sth：理解某事，领悟某事
例：He is very quick to catch on to things.
catch on (with sb)：（在某群体中）流行起来
例：I wonder if the game will ever catch on with young people?
表示理解
Please repeat what you said—I didn't quite catch on.
It took me a while to catch on to the new system at work.
表示流行
This fashion caught on quickly in major cities.
Electric vehicles are catching on as people become more eco-conscious.
否定与疑问用法
The proposal didn’t catch on with the committee.
Do you think this new technology will catch on globally?
时态变化：过去式/过去分词为 caught on（如：The idea caught on eventu