un·der·cov·er 
/ˌʌndɚˈkʌvɚ/ adjective
/ˌʌndɚˈkʌvɚ/ adjective : done or working in a secret way in order to catch criminals or collect information
▪ an undercover investigation ▪ undercover officers/agents
▪ an undercover investigation ▪ undercover officers/agents
— undercover adverb
▪ He went undercover as a drug dealer. ▪ The agent has worked undercover in several countries.
▪ He went undercover as a drug dealer. ▪ The agent has worked undercover in several countries.
