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Adverb: all at once
  1. All at the same time
    "Let's say 'Yes!' all at once"
    - all together, holus-bolus [N. Amer]
     
  2. Without warning
    "all at once, he started shouting"
    - all of a sudden

Encyclopedia: All at once

Nearest

alkyl radical
alkylating agent
alkylbenzene
alkylbenzenesulfonate
alkylic
alkyne
all
all along
all around
all arounder
all at once
all but
all clear
all day long
all ears
all fired up
All Fools' day
all fours
all get out
all important
all in