quick as a flash
Proposed by a contributor, not yet supported by evidence.
Where it’s used:
Used
Widespread English
Examples
Quick as a flash, the Thing replies: ' The bog. '
I was suddenly stunned by Heather's amazing speed and decisiveness; quick as a flash she had booked into the B&B!
British National Corpus sentence via the MAGPIE corpus (CC BY 4.0, retrieved 2026-07-30)
Sources & notes
Listed in Wiktionary’s “English idioms” category (retrieved 2026-07-29); definition pending editorial review. Figurative class: Simile (PIE-English corpus, CC BY 4.0, retrieved 2026-07-31).
Common questions
What does “quick as a flash” mean?
Very fast.
Is “quick as a flash” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.