wait in the wings
US /weɪt ɪn ðə wɪŋz/
UK /weɪt ɪn ðə wɪŋz/

1.
在幕后待命, 等待时机
to be ready to do something or to take someone's place, especially in a play or other performance
:
•
The understudy is waiting in the wings, ready to perform if the main actor falls ill.
替补演员在幕后待命,如果主角生病就准备上场。
•
There are several talented young players waiting in the wings for a chance to join the first team.
有几位才华横溢的年轻球员在幕后等待加入一线队的机会。