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“All the sudden” or “all of a sudden”: which is correct?

The short answer

All of a sudden is the correct expression, which indicates something happening unexpectedly or abruptly.

Phrase misconstruction

Why people get it wrong

People often mishear or conflate all of a sudden as all the sudden, likely due to the similarity in sound and casual speech patterns.

Examples with all of a sudden

  • All of a sudden, the lights went out.
  • It started raining all of a sudden.
  • All of a sudden, she stood up and left the room.

Quick check

 , the lights went out.

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