bide one's time: to wait for further developments.

等待时机，耐心等待；等待更进一步的发展。

 

standby:Of, relating to, or waiting for unreserved travel space that is made available by an airline only shortly before departure:
等待退票（或余票）的;在飞机起飞前等待退票或未预定的票的或与之相关的：
standby passengers.
等退票的旅客