What to catch up?

[registered]

"Friendship is taking time out, once school has calmed down a little, just to chat and catch up."
Here, what does "catch up" mean? to catch up what?

Thanks!

[emsr2d2]

"Friendship is taking time out, once school has calmed down a little, just to chat and catch up."
Here, what does "catch up" mean? to catch up what?

Thanks!

If you "catch up" with a friend, you tell each other the things that have happened since the last time you spoke. You bring them up-to-date with your life.

It's a phrasal verb with several meanings but all based on the same premise.