私し服ふく刑けい事じ

noun

plainclothes police officer; plain-clothes detective

Refers to a police officer or detective who works in civilian clothes rather than a uniform. Often used in crime fiction and news reports.

See also: 私服警官

• 私し服ふく刑けい事じが繁はん華か街がいで張はり込こみをしていた。

  A plainclothes detective was on a stakeout in the downtown area.

• 彼かれは私し服ふく刑けい事じだと気きづかれずに容よう疑ぎ者しゃに近ちかづいた。

  He approached the suspect without being noticed as a plainclothes officer.