Cách sử dụng
"Catch on" is a phrase that means to understand or to realize something. It is often used when someone needs to explain something or teach something to others, and they want to know if the others understand it. For example, if a teacher explains a math problem to a student and asks them if they understand, they might ask "Did you catch on?" or "Did it catch on yet?" It is also used when something becomes popular or when someone starts to understand a trend or idea. For example, if a new fashion trend becomes popular, people might say "It's finally starting to catch on!"