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English definition of “all of a sudden”

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all of a sudden

informal
B2 very quickly: It seemed to happen all of a sudden - I felt dizzy and I just collapsed.
Translations of “all of a sudden”
in Chinese (Traditional) 一下子, 突然間…
in Chinese (Simplified) 一下子, 突然间…
(Definition of all of a sudden from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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