Definition of catch up phrasal verb from the Oxford Advanced American Dictionary

 

catch up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    catch up (on something)

     
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  1. 1to spend extra time doing something because you have not done it earlier I have a lot of work to catch up on.
  2. 2to find out about things that have happened We spent the evening catching up on each other's news.

    catch up (with somebody)

     
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  1. 1 to reach someone who is ahead by going faster Go on ahead. I'll catch up with you.
  2. 2 to reach the same level or standard as someone who was better or more advanced After missing the fall semester, he had to work hard to catch up.
See the Oxford Advanced Learner's Dictionary entry: catch up