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all at once adverb

  /ˌɑl ət ˈwʌn(t)s/ , /ˌɔl ət ˈwʌn(t)s/ , /ˌɔːl ət ˈwʌn(t)s/
  • (idiomatic) Unexpectedly; without warning; all of a sudden.
abrupt
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