Definition of catch up phrasal verb from the Oxford Advanced Learner's Dictionary

  

catch up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    catch up (with somebody)

    (British English also catch somebody up)
     
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  1. 1  to reach somebody who is ahead by going faster Go on ahead. I'll catch up with you. I'll catch you up.
  2. 2  to reach the same level or standard as somebody who was better or more advanced After missing a term through illness he had to work hard to catch up with the others.
See the Oxford Advanced American Dictionary entry: catch up