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

1.
當配角, 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.
她厭倦了總是給姐姐當配角。
•
He's a talented musician, but he always seems to play second fiddle in the band.
他是一位才華橫溢的音樂家,但他似乎總是在樂隊中扮演次要角色。