wear the trousers

Từ điển Oxford Advanced Learner 8th

wear the ˈtrousers idiom
(BrE) (NAmE wear the ˈpants) (often disapproving) (especially of a woman)to be the person in a marriage or other relationship who makes most of the decisions
•It's obvious who wears the trousers in that family!
Main entry: ↑wear_idiom