密探的英文：
a stool pigeon
nark
stool pigeon

参考例句：

A common [professional] informer
专业密探

undercover FBI agents.
从事秘密调查的联邦调查局密探

An informer;a stool pigeon.
告密者;密探

Stool pigeon
(警察局的)密探

He is allegedly a police agent.
据传他是警方的密探。

Had he ever been a spy himself?
他自己做过密探么？

An investigator,especially a detective.
密探一个调查者，尤指侦探

訤een observing him attentively approach
这人就是警察厅的密探费克斯。

Person employed to help in catching suspected criminals by tempting them to act illegally
(受雇诱使嫌疑犯触犯刑律以便将之逮捕的)密探,坐探.

stool pigeon
[美]?鸽;[俚](诱人赌博等的)?子;[俚](警察局的)密探

stool是什么意思：
n. 凳子；大便，粪便
v. 长新枝；分檗

Between two stools you fall to the ground
脚踏两条船,迟早会落水

a rickety stool, table, bed, etc
快要散架的凳子、 桌子、 床等

The stool may contain blood and mucus.
粪便或会带血及黏液。

pigeon是什么意思：
n. 鸽子；鸽肉；土鸽飞靶；傻瓜
v. 诈骗

These proud pigeons are the model of birdhood.
这些光荣的信鸽是鸟类的楷模。

A pigeon was cooing up in one of the elms.
一只鸽子在榆树上咕咕地叫。

He was a pigeon, a victim of a confidence game.
他上当受骗了。

nark是什么意思：
n. 警察的线民,密探
vt.
vi. 作线民,密告