Definition of undercover in English:

undercover

Line breaks: under|cover
Pronunciation: /ʌndəˈkʌvə
 
, ˈʌndə-/

adjective

Involving secret work within a community or organization, especially for the purposes of police investigation or espionage: an undercover police operation [as adverb]: he worked undercover in Northern Ireland
More 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.
Synonyms

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Word of the day erroneous
Pronunciation: ɪˈrəʊnɪəs
adjective
wrong; incorrect