catch somebody up

Từ điển Oxford Advanced Learner 8th

ˌcatch ˈup (with sb) derived
(BrE also ˌcatch sb ˈup)
1. to reach sb who is ahead by going faster
• Go on ahead. I'll catch up with you.
• I'll catch you up.
2. to reach the same level or standard as sb who was better or more advanced
• After missing a term through illness he had to work hard to catch up with the others.
Main entry: ↑catch_derived