plainclothes

About 0.15 uses per million words.

Meaning

1. adjective Of a police officer, wearing ordinary civilian clothes instead of a uniform, in order to avoid detection.
2. noun Ordinary civilian clothes, rather than uniform.

Similar words

plain-clothes civilian civil clothes clothed cladly dressed broadclothed beuniformed habilimented becloaked

Often followed by

police officers policemen men detectives policeman detective officer man cops