punch above your weight

Từ điển Oxford Advanced Learner 8th

ˌpunch above your ˈweight idiom
to be or try to be more successful than others in doing sth that normally requires more skill, experience, money, etc. than you have
•This player seems to be able to constantly punch above his weight.
•He punched above his weight as the party's foreign affairs spokesman.
Main entry: ↑punch_idiom