Feedback
catch on
Become popular
Finally understand what is going on
catch up with
Do something that should have been done earlier
Meet someone after a period of time and find out what they have been doing
When something negative starts to have an effect
Punish someone after they have been doing something wrong for a long time
Learn something new that many people already understand
catch up on
Do something that should have been done earlier
Reminisce with an old friend after not seeing them for a while
catch at
Take or grab hold of something
catch up in
Become involved, often against one�s will
catch out
Trick
Discover or prove that someone is lying
Put someone in an unexpected and difficult situation (often passive)
catch up
Get work, etc, up to date.
Reach someone who was ahead of you