adj
plainclothes
adj
1
Wearing ordinary civilian clothing rather than a uniform, especially of police officers.
"Two plainclothes detectives watched the building from across the street."
How to Use Plainclothes
Learner’s notesIn plain EnglishDescribes police or security staff dressed as ordinary civilians rather than in uniform, usually to avoid being noticed.
Common pairings
plainclothes officer
plainclothes detective
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Two _____ detectives watched the building from across the street.