play second fiddle to somebody

Từ điển Oxford Advanced Learner 8th

play second ˈfiddle (to sb/sth) idiom
to be treated as less important than sb/sth; to have a less important position than sb/sth else
•I'm not going to play second fiddle to anyone.
•The narrative in this book plays second fiddle to the excellent photographs.
Main entry: ↑fiddle_idiom