English

Adverb

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 as an idiom: All at the same time; all together.

   There are too many to get in the lift all at once, so some must wait.‎

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