at once
1
immediately or without delay
- He addressed the issue at once to prevent further complications.
- The manager approved the request at once, recognizing its urgency.
- The emergency team was dispatched at once to the accident site.
- Realizing the danger, they evacuated the building at once.
- The system detected the error and corrected it at once.
2
occurring or happening simultaneously
- She answered the phone and started writing notes at once.
- The rain poured and the wind howled at once, making the storm feel more intense.
- The phone rang and the dog started barking at once, disrupting the quiet.
- The performers started singing at once, creating a beautiful harmony.
- The lightning flashed and thunder roared at once, shaking the entire building.