dust somebody off

Từ điển Oxford Advanced Learner 8th

ˌdust sb/sthˈoff derived
to remove dust, dirt, etc. from sb/sth
•She got out the best china and dusted it off.
•He put down the box and dusted off his hands.
• (figurative)For the concert, he dusted off some of his old hits.
Main entry: ↑dust_derived