catch on
US /kætʃ ɑːn/
UK /kætʃ ɑːn/
1.
to become popular or fashionable
:
•
The new dance craze is starting to catch on.
•
I don't think that idea will ever catch on.
2.
to understand or realize something
:
•
It took him a while to catch on to the joke.
•
She quickly caught on to what I was trying to say.