"Catch you" means that they will meet up with you. They're saying they will see you later.
I was momentarily taken aback when the ploice officer said, "Catch you later."
It means his voice gave out from emotion, so there was a slight hesitation in his words. It is not an idiom, but an expression whose meaning may be guessed from an understanding of the words in it.
Keep an idea in ones head to act on it later.
See you later
It means that the person is slow to catch on... isn't understanding things as quickly as other people.
The idiom don't pass the buck don't pass along your responsibility. An example using the idiom is: If you do something unkind or silly don't pass the buckThat's all from me see ya later!
Idioms "catch on" because they are colorful ways of communicating.
A form of goodbye meaning he will see you later. Don't read anything into it.
She wore the bright red dress hoping to catch the fancy of her handsome coworker.
It means you should be willing to risk a small amount in order to get a larger amount back.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.