plainclothes

adj.便衣(尤指不穿制服的警察)的

便衣；便衣警察；平常衣服装束中的；不穿制服的。

名词

1. The plainclothes officer went undercover to investigate the drug trafficking ring.
这位便衣警察潜入调查毒品贩运团伙。

2. The detective in plainclothes blended in with the crowd, unnoticed by the suspects.
那名便衣侦探与人群融为一体，未被犯罪嫌疑人注意到。