blow cover

blow someone's cover

Sl. to reveal someone's true identity; to ruin someone's scheme for concealment. The dog recognized me and blew my cover. I didn't mean to blow your cover by calling out to you.
See also: blow, cover

blow somebody's cover

to make secret information about someone known Herman had been a spy for 20 years before someone blew his cover.
See also: blow, cover

blow somebody's cover

to let people know secret information about who someone is or what someone is doing Someone recognised him and phoned the newspapers, which blew his cover.
See also: blow, cover
References in periodicals archive ?
WIDESPREAD DAMAGE: HEAVY BLOW covers (JH180613Hlinthwaite) one of the manhole covers (JH180613Hlinthwaite) UNDERGROUND explosions blowing heavy manhole covers into the air made the news this week - but not for the first time.