play second fiddle
US /pleɪ ˈsɛkənd ˈfɪdl/
UK /pleɪ ˈsɛkənd ˈfɪdl/

1.
当配角, 居次要地位
to be in a subordinate or less important position than someone else
:
•
She's tired of always having to play second fiddle to her older sister.
她厌倦了总是给姐姐当配角。
•
He's a talented musician, but he always seems to play second fiddle in the band.
他是一位才华横溢的音乐家,但他似乎总是在乐队中扮演次要角色。