new broom

Từ điển Oxford Advanced Learner 8th

▪ I. ˌnew ˈbroom [new broom] BrE NAmE noun (BrE)
a person who has just started to work for an organization, especially in a senior job, and who is likely to make a lot of changes
 
▪ II. a new ˈbroom idiom
(BrE, often disapproving)a person who has just started to work for an organization, department, etc, especially in a senior job, and who is likely to make a lot of changes
•Well, you know what they say— A new broom sweeps clean.
Main entry: ↑new_idiom