all at once | Dictionaries and vocabulary tools for English language learners

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all at once	suddenly. [2 definitions]
at once	at the same time. [2 definitions]
every once in a while	from time to time; occasionally.
once and for all	firmly and decisively, with absolute finality. [2 definitions]
once in a blue moon	from time to time, but very rarely.
once in a while	sometimes but not very often; occasionally.
once-over	(informal) a hasty look at and evaluation of something or someone.

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