catch on

US /kætʃ ɑːn/
UK /kætʃ ɑːn/
"catch on" picture
1.

pegar, tornar-se popular

to become popular or fashionable

:
The new dance craze is starting to catch on.
A nova moda de dança está começando a pegar.
I don't think that idea will ever catch on.
Não acho que essa ideia vá pegar um dia.
2.

entender, perceber

to understand or realize something

:
It took him a while to catch on to the joke.
Demorou um pouco para ele entender a piada.
She quickly caught on to what I was trying to say.
Ela rapidamente entendeu o que eu estava tentando dizer.