keep up with somebody

Từ điển Oxford Advanced Learner 8th

▪ I. ˌkeep ˈup with sb derived
to continue to be in contact with sb
•How many of your old school friends do you keep up with?
Main entry: ↑keep_derived
 
▪ II. ˌkeep ˈup (with sb/sth) derived
to move, make progress or increase at the same rate as sb/sth
• Slow down— I can't keep up!
• I can't keep up with all the changes.
•Wages are not keeping up with inflation.
Main entry: ↑keep_derived