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English definition of “all at once”

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all at once

C1 suddenly and unexpectedly: All at once there was a loud crashing sound.
Translations of “all at once”
in Chinese (Traditional) 突然,忽然…
in Chinese (Simplified) 突然,忽然…
(Definition of all at once from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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