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all of a sudden

adverb

1 all of a sudden

Without warning.

synonym: all at once.

2 all of a sudden

Happening unexpectedly.

synonyms: of a sudden, suddenly.


Moby thesaurus: abruptly, bang, dash, hastily, impetuously, impulsively, like a flash, like a thunderbolt, of a sudden, on short notice, plop, plump, plunk, pop, precipitantly, precipitately, precipitously, sharp, short, slap ... show more.

Find more on all of a sudden elsewhere: etymology - rhymes - Wikipedia.

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