- (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 operationMore example sentences
- In March 1999, police began an undercover surveillance operation on the prison officer.
- Two cases emphasise the need for the use of cautions in connection with police undercover operations.
- The charges arise out of a police undercover operation in the latter part of 1998.
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- As an undercover agent: a special unit of the police that operates undercoverMore example sentences
- She said two police officers went undercover for three weeks in the town at the end of July, calling themselves Matt and Anne.
- Police went undercover at a Catholic mass to root out yobs who attacked the parish priest.
- The claims are made by a former British soldier who worked undercover within the IRA.