bin6 ji1便衣

Jyutpingbin6 ji1
Yalebihn yī
名詞Uncommon

Definition

A plainclothes police officer.

colloquialpeoplework

How it's used

Refers specifically to police officers who intentionally hide their identity by wearing civilian clothes to conduct surveillance or make arrests. It is common to hear it used as a noun to describe the person rather than just the state of dress. Unlike formal descriptions, it carries a sense of stealth and professional secrecy.

Measure word

go3go

Examples

There are a few plainclothes officers over there investigating a case.
How did you know that person was a plainclothes officer?

Common phrases

plainclothes detective
plainclothes police officer

Common mistake

Do not confuse this with simply wearing casual clothes, which is 著便服. Using 便衣 to describe a regular person in casual clothes is incorrect as it implies they are law enforcement.

Grammar color guide

Noun
Verb
Adjective
Adverb
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