Undercover
/ˌʌndərˈkʌvər/
Synonyms
- hidden
- secret
- surreptitious
- clandestine
- covert
Slang Meanings
A person posing as someone else to blend in.
He's going undercover at the party, pretending to be a new student.
In the context of secretive operations.
They're running a few undercover gigs this weekend.