All of a sudden definitions

All of a sudden

1) Unexpectedly
Found on https://www.crosswordclues.com/clue/all-of-a-sudden

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all of a sudden

[adv] - without warning
Found on http://www.webdictionary.co.uk/definition.php?query=all%20of%20a%20sudden

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all of a sudden

all at once adverb without warning; `all at once, he started shouting`
Found on https://www.encyclo.co.uk/local/20974

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