blow someone's cover
Proposed by a contributor, not yet supported by evidence.
Meaning · English
Recognized English idiom; full definition pending editorial review.
Where it’s used:
Used
Widespread English
Examples
One mistake could blow his cover and ruin years of careful work in the North.
And after such a lengthy period of secrecy, was Lucy going to blow her cover so comprehensively in a single gesture?
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.
Common questions
What does “blow someone's cover” mean?
Recognized English idiom; full definition pending editorial review.
Is “blow someone's cover” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.