"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."
The idiom "catch the moon" means pursuing an impossible or unattainable goal, something that is beyond reach or out of grasp, like trying to catch the moon in the sky. It implies striving for something that is unlikely to be achieved.
Keep an idea in ones head to act on it 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.
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.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
It is not an idiom, it means your nose is itching.