Which is correct:
"all of a sudden" or "all in a sudden"?

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all of a sudden

This phrase is correct and commonly used in English.

This phrase is used to describe something happening quickly and unexpectedly.

Examples:

  • She left all of a sudden.
  • All of a sudden, the lights went out.
  • He appeared all of a sudden.
  • The storm hit all of a sudden.
  • All of a sudden, everything changed.

all in a sudden

This phrase is not a standard English expression.

The correct phrase is 'all of a sudden.' 'All in a sudden' is not a standard English expression. 'All of a sudden' is a common idiom used to describe something happening quickly and unexpectedly.

Last updated: March 24, 2024

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