round something off with something

Từ điển Oxford Advanced Learner 8th

ˌround sthˈoff (with sth) derived
1. (NAmE also ˌround sthˈout)to finish an activity or complete sth in a good or suitable way
•She rounded off the tour with a concert at Carnegie Hall.
2. to take the sharp or rough edges off sth
•You can round off the corners with sandpaper.
Main entry: ↑round_derived