Definition
This idiom describes someone who is repeatedly in a supporting role, never achieving the main position or recognition in significant situations.
總是做配角，無法當主角
She always dreamed of being the company president, but it seems she will always be a second-in-command, always a bridesmaid, never the bride.
她一直夢想成為公司總裁，但似乎永遠是二把手，總是伴娘，從未當過新娘。
In every election, he is always an indispensable part of the campaign team, but never the candidate; he is always a bridesmaid, never the bride.
在每次選舉中，他總是競選團隊中不可或缺的一部分，但從未成為候選人；他總是伴娘，從未當過新娘。
She has received multiple Oscar nominations, but has never won, it seems she is always a bridesmaid, never the bride.
她多次獲得奧斯卡提名，但從未獲獎，似乎她總是伴娘，從未當過新娘。