all at once

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all at once (not comparable)

  1. (idiomatic) Unexpectedly; without warning; all of a sudden.
    • William Wordsworth, Daffodils
      When all at once I saw a crowd, / A host, of golden daffodils
    • 1913, Joseph C. Lincoln, chapter 4, in Mr. Pratt's Patients:
      I was on my way to the door, but all at once, through the fog in my head, I began to sight one reef that I hadn't paid any attention to afore.
  2. Used other than with a figurative or idiomatic meaning: All at the same time; all together.
    There are too many to get in the lift all at once, so some must wait.