| 单词 | all at once | 
| 释义 | all at once phrase   See full dictionary entry for  once If something happens all at once, it happens suddenly, often when you are not expecting it to happen.   I feel terribly sleepy all at once.    All at once there was someone knocking on the door.   Synonyms:  suddenly, unexpectedly, abruptly, all of a sudden      | 
	
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