plain
clothes
1
(of a police officer) dressed in civilian clothes while on duty
- The detectives dressed in plain-clothes to blend in with the crowd during the undercover operation.
- The plain-clothes officers quietly monitored the suspect's movements from across the street.
- She was surprised when the plain-clothes officer revealed his identity and badge.
- Plain-clothes detectives often work on cases requiring discreet surveillance and investigation.
- The plain-clothes team infiltrated the criminal organization to gather intelligence on their activities.