-in-waiting
combining form
1.
- denoting a position as attendant to a royal personage表示“王室随从”：
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lady-in-waiting.
2.
- awaiting a turn, confirmation of a process, etc.等待（时机、过程确认等）的：
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a political administration-in-waiting.
- ■ about to happen即将发生的：
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an explosion-in-waiting.