Definition of undercover in English:

undercover

adjective

  • (of a person or their activities) involved in or involving secret work within a community or organization, especially for the purposes of police investigation or espionage.

    ‘an undercover police operation’
    • ‘During the trial, two undercover police officers gave evidence from behind a screen to protect their identities.’
    • ‘During the day, he was approached at different times by three undercover police officers and each time he sold four pills to each of them.’
    • ‘Townend said he believed they were undercover police officers.’
    • ‘The three men were caught after an undercover surveillance operation.’
    • ‘She pleaded guilty to offering to supply heroin to undercover police officers.’
    • ‘I did not go around believing that I was an undercover policeman or an Interpol agent.’
    • ‘An undercover police officer had recorded conversations with both men.’
    • ‘Two cases emphasise the need for the use of cautions in connection with police undercover operations.’
    • ‘A heroin addict caught supplying drugs to police in an undercover investigation has been jailed for four years.’
    • ‘An undercover police operation has snared eight dealers who provided a class A drugs on wheels delivery service.’
    • ‘Two drug dealers were jailed for a total of more than seven years after an undercover police operation led to their arrests.’
    • ‘How the undercover police officers managed to make their way inside was not revealed.’
    • ‘The charges arise out of a police undercover operation in the latter part of 1998.’
    • ‘Metro police has 24 undercover officers who are constantly on the look out for illegal activity.’
    • ‘In March 1999, police began an undercover surveillance operation on the prison officer.’
    • ‘His scam ran for three years, ending in September 2001, after a sting conducted by undercover police.’
    • ‘In Ireland, the new arrivals were soon being tailed by police and undercover agents.’
    • ‘Woodall told the jury at the trial she believed Douglas was an undercover police officer from Greater Manchester.’
    • ‘At first he suspected I was an undercover police officer and they were being set up.’
    • ‘This is the haul of alcohol seized by police in an undercover operation targeting young drinkers.’
    covert, secret, clandestine, private, confidential, conspiratorial, underground, surreptitious, furtive, cloak-and-dagger, hole-and-corner, hugger-mugger, back-alley, backstair, stealthy, closet
    intelligence
    hidden, concealed, masked, veiled, shrouded
    black
    hush-hush, sneaky
    View synonyms

adverb

  • As an undercover agent.

    ‘a special unit of the police that operates undercover’
    • ‘A stockbroker turned writer, he actually went undercover inside an authentic crime family.’
    • ‘She said two police officers went undercover for three weeks in the town at the end of July, calling themselves Matt and Anne.’
    • ‘Actually, Yan is kicked out so he can be sent undercover to infiltrate the triad crime world.’
    • ‘The claims are made by a former British soldier who worked undercover within the IRA.’
    • ‘I'm a detective working undercover with three other detectives and Noah here.’
    • ‘The legislation to allow us to send children undercover didn't include the selling of alcohol until December.’
    • ‘He contacted the TUC after the Bradford riots and spent three years working undercover.’
    • ‘Police went undercover at a Catholic mass to root out yobs who attacked the parish priest.’
    • ‘The document establishes that Plame has worked undercover within the past five years.’
    • ‘On my return to the UK I worked undercover against the Iranian intelligence service.’
    • ‘I'm going to stay undercover for the rest of my life.’
    covert, secret, clandestine, private, confidential, conspiratorial, underground, surreptitious, furtive, cloak-and-dagger, hole-and-corner, hugger-mugger, back-alley, backstair, stealthy, closet
    intelligence
    hidden, concealed, masked, veiled, shrouded
    black
    hush-hush, sneaky
    View synonyms

Pronunciation:

undercover

/ˌəndərˈkəvər/