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blow someone's cover.

Phrase / Idiom
Conversational
MEANING

To reveal someone’s secret identity or role, undermining their attempt to remain undiscovered.

Use it for

Words that belong together

  • blow an agent’s cover
  • risk blowing someone’s cover

On the page

Calling her by her real name would have blown her cover.
The familiar greeting nearly blew the investigator’s cover before the interview began.
Word forms
Base
blow someone's cover

Usage notes

Verbal idiom: blow/blows/blew/blown/blowing someone’s cover. The possessive identifies whose concealed identity or role is exposed. Register: informal. Commonness: common (qualitative editorial estimate, informed by dictionaries/corpus).

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