all at once
The idiom "all at once" is used to describe events that happen either simultaneously or suddenly.
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Definition
B2General
(informal)Occurring or done at the same time.
Example
- The kids shouted 'Surprise!' all at once.
- The lights in the building went out all at once.
B2General
(informal)Happening suddenly and without warning.
Example
- All at once, the storm hit.
- He started laughing all at once.
Similar
Terms that have similar or relatively close meanings to "all at once":
at onceat one timeat one strokeat a timeat oneall togetherall as oneat the same timeen masseone after anotherat one blastin oneall insingle timeright awayall in allall of