Meaning of “all of a sudden” in the English Dictionary

british dictionary

"all of a sudden" in British English

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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.

(Definition of “all of a sudden” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"all of a sudden" in American English

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all of a sudden

also all at once

quickly and without warning:

All of a sudden we heard a loud noise.

(Definition of “all of a sudden” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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